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Nodes stats

The nodes stats API returns statistics about your cluster.

Path and HTTP methods

GET /_nodes/stats
GET /_nodes/<node_id>/stats
GET /_nodes/stats/<metric>
GET /_nodes/<node_id>/stats/<metric>
GET /_nodes/stats/<metric>/<index_metric>
GET /_nodes/<node_id>/stats/<metric>/<index_metric>

Path parameters

The following table lists the available path parameters. All path parameters are optional.

Parameter Type Description
nodeId String A comma-separated list of nodeIds used to filter results. Supports node filters. Defaults to _all.
metric String A comma-separated list of metric groups that will be included in the response. For example, jvm,fs. See the list of all metrics below. Defaults to all metrics.
index_metric String A comma-separated list of index metric groups that will be included in the response. For example, docs,store. See the list of all index metrics below. Defaults to all index metrics.

The following table lists all available metric groups.

Metric Description
indices Index statistics, such as size, document count, and search, index, and delete times for documents.
os Statistics about the host OS, including load, memory, and swapping.
process Statistics about processes, including their memory consumption, open file descriptors, and CPU usage.
jvm Statistics about the JVM, including memory pool, buffer pool, and garbage collection, and the number of loaded classes.
fs File system statistics, such as read/write statistics, data path, and free disk space.
transport Transport layer statistics about send/receive in cluster communication.
http Statistics about the HTTP layer.
breaker Statistics about the field data circuit breakers.
script Statistics about scripts, such as compilations and cache evictions.
discovery Statistics about cluster states.
ingest Statistics about ingest pipelines.
adaptive_selection Statistics about adaptive replica selection, which selects an eligible node using shard allocation awareness.
script_cache Statistics about script cache.
indexing_pressure Statistics about the node’s indexing pressure.
shard_indexing_pressure Statistics about shard indexing pressure.

To filter the information returned for the indices metric, you can use specific index_metric values. You can use these only when you use the following query types:

GET _nodes/stats/
GET _nodes/stats/_all
GET _nodes/stats/indices

The following index metrics are supported:

  • docs
  • store
  • indexing
  • get
  • search
  • merge
  • refresh
  • flush
  • warmer
  • query_cache
  • fielddata
  • completion
  • segments
  • translog
  • request_cache

For example, the following query requests statistics for docs and search:

GET _nodes/stats/indices/docs,search

Query parameters

The following table lists the available query parameters. All query parameters are optional.

Parameter Type Description
completion_fields String The fields to include in completion statistics. Supports comma-separated lists and wildcard expressions.
fielddata_fields String The fields to include in fielddata statistics. Supports comma-separated lists and wildcard expressions.
fields String The fields to include. Supports comma-separated lists and wildcard expressions.
groups String A comma-separated list of search groups to include in the search statistics.
level String Specifies whether statistics are aggregated at the cluster, index, or shard level. Valid values are indices, node, and shard.
timeout Time Sets the time limit for node response. Default is 30s.
include_segment_file_sizes Boolean If segment statistics are requested, this field specifies to return the aggregated disk usage of every Lucene index file. Default is false.

Example request

GET _nodes/stats/

Example response

{
  "_nodes" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "cluster_name" : "docker-cluster",
  "nodes" : {
    "F-ByTQzVQ3GQeYzQJArJGQ" : {
      "timestamp" : 1664484195257,
      "name" : "opensearch",
      "transport_address" : "127.0.0.1:9300",
      "host" : "127.0.0.1",
      "ip" : "127.0.0.1:9300",
      "roles" : [
        "cluster_manager",
        "data",
        "ingest",
        "remote_cluster_client"
      ],
      "attributes" : {
        "shard_indexing_pressure_enabled" : "true"
      },
      "indices" : {
        "docs" : {
          "count" : 13160,
          "deleted" : 12
        },
        "store" : {
          "size_in_bytes" : 6263461,
          "reserved_in_bytes" : 0
        },
        "indexing" : {
          "index_total" : 0,
          "index_time_in_millis" : 0,
          "index_current" : 0,
          "index_failed" : 0,
          "delete_total" : 204,
          "delete_time_in_millis" : 427,
          "delete_current" : 0,
          "noop_update_total" : 0,
          "is_throttled" : false,
          "throttle_time_in_millis" : 0
        },
        "get" : {
          "total" : 4,
          "time_in_millis" : 18,
          "exists_total" : 4,
          "exists_time_in_millis" : 18,
          "missing_total" : 0,
          "missing_time_in_millis" : 0,
          "current" : 0
        },
        "search" : {
          "open_contexts" : 0,
          "query_total" : 194,
          "query_time_in_millis" : 467,
          "query_current" : 0,
          "fetch_total" : 194,
          "fetch_time_in_millis" : 143,
          "fetch_current" : 0,
          "scroll_total" : 0,
          "scroll_time_in_millis" : 0,
          "scroll_current" : 0,
          "suggest_total" : 0,
          "suggest_time_in_millis" : 0,
          "suggest_current" : 0
        },
        "merges" : {
          "current" : 0,
          "current_docs" : 0,
          "current_size_in_bytes" : 0,
          "total" : 1,
          "total_time_in_millis" : 5,
          "total_docs" : 12,
          "total_size_in_bytes" : 3967,
          "total_stopped_time_in_millis" : 0,
          "total_throttled_time_in_millis" : 0,
          "total_auto_throttle_in_bytes" : 251658240
        },
        "refresh" : {
          "total" : 74,
          "total_time_in_millis" : 201,
          "external_total" : 57,
          "external_total_time_in_millis" : 314,
          "listeners" : 0
        },
        "flush" : {
          "total" : 28,
          "periodic" : 28,
          "total_time_in_millis" : 1261
        },
        "warmer" : {
          "current" : 0,
          "total" : 45,
          "total_time_in_millis" : 99
        },
        "query_cache" : {
          "memory_size_in_bytes" : 0,
          "total_count" : 0,
          "hit_count" : 0,
          "miss_count" : 0,
          "cache_size" : 0,
          "cache_count" : 0,
          "evictions" : 0
        },
        "fielddata" : {
          "memory_size_in_bytes" : 356,
          "evictions" : 0
        },
        "completion" : {
          "size_in_bytes" : 0,
          "fields" : { }
        },
        "segments" : {
          "count" : 17,
          "memory_in_bytes" : 0,
          "terms_memory_in_bytes" : 0,
          "stored_fields_memory_in_bytes" : 0,
          "term_vectors_memory_in_bytes" : 0,
          "norms_memory_in_bytes" : 0,
          "points_memory_in_bytes" : 0,
          "doc_values_memory_in_bytes" : 0,
          "index_writer_memory_in_bytes" : 0,
          "version_map_memory_in_bytes" : 0,
          "fixed_bit_set_memory_in_bytes" : 288,
          "max_unsafe_auto_id_timestamp" : -1,
          "file_sizes" : { }
        },
        "translog" : {
          "operations" : 12,
          "size_in_bytes" : 1452,
          "uncommitted_operations" : 12,
          "uncommitted_size_in_bytes" : 1452,
          "earliest_last_modified_age" : 164160
        },
        "request_cache" : {
          "memory_size_in_bytes" : 1649,
          "evictions" : 0,
          "hit_count" : 0,
          "miss_count" : 18
        },
        "recovery" : {
          "current_as_source" : 0,
          "current_as_target" : 0,
          "throttle_time_in_millis" : 0
        }
      },
      "os" : {
        "timestamp" : 1664484195263,
        "cpu" : {
          "percent" : 0,
          "load_average" : {
            "1m" : 0.0,
            "5m" : 0.0,
            "15m" : 0.0
          }
        },
        "mem" : {
          "total_in_bytes" : 13137076224,
          "free_in_bytes" : 9265442816,
          "used_in_bytes" : 3871633408,
          "free_percent" : 71,
          "used_percent" : 29
        },
        "swap" : {
          "total_in_bytes" : 4294967296,
          "free_in_bytes" : 4294967296,
          "used_in_bytes" : 0
        },
        "cgroup" : {
          "cpuacct" : {
            "control_group" : "/",
            "usage_nanos" : 338710071600
          },
          "cpu" : {
            "control_group" : "/",
            "cfs_period_micros" : 100000,
            "cfs_quota_micros" : -1,
            "stat" : {
              "number_of_elapsed_periods" : 0,
              "number_of_times_throttled" : 0,
              "time_throttled_nanos" : 0
            }
          },
          "memory" : {
            "control_group" : "/",
            "limit_in_bytes" : "9223372036854771712",
            "usage_in_bytes" : "1432346624"
          }
        }
      },
      "process" : {
        "timestamp" : 1664484195263,
        "open_file_descriptors" : 556,
        "max_file_descriptors" : 65536,
        "cpu" : {
          "percent" : 0,
          "total_in_millis" : 170870
        },
        "mem" : {
          "total_virtual_in_bytes" : 6563344384
        }
      },
      "jvm" : {
        "timestamp" : 1664484195264,
        "uptime_in_millis" : 21232111,
        "mem" : {
          "heap_used_in_bytes" : 308650480,
          "heap_used_percent" : 57,
          "heap_committed_in_bytes" : 536870912,
          "heap_max_in_bytes" : 536870912,
          "non_heap_used_in_bytes" : 147657128,
          "non_heap_committed_in_bytes" : 152502272,
          "pools" : {
            "young" : {
              "used_in_bytes" : 223346688,
              "max_in_bytes" : 0,
              "peak_used_in_bytes" : 318767104,
              "peak_max_in_bytes" : 0,
              "last_gc_stats" : {
                "used_in_bytes" : 0,
                "max_in_bytes" : 0,
                "usage_percent" : -1
              }
            },
            "old" : {
              "used_in_bytes" : 67068928,
              "max_in_bytes" : 536870912,
              "peak_used_in_bytes" : 67068928,
              "peak_max_in_bytes" : 536870912,
              "last_gc_stats" : {
                "used_in_bytes" : 34655744,
                "max_in_bytes" : 536870912,
                "usage_percent" : 6
              }
            },
            "survivor" : {
              "used_in_bytes" : 18234864,
              "max_in_bytes" : 0,
              "peak_used_in_bytes" : 32721280,
              "peak_max_in_bytes" : 0,
              "last_gc_stats" : {
                "used_in_bytes" : 18234864,
                "max_in_bytes" : 0,
                "usage_percent" : -1
              }
            }
          }
        },
        "threads" : {
          "count" : 80,
          "peak_count" : 80
        },
        "gc" : {
          "collectors" : {
            "young" : {
              "collection_count" : 18,
              "collection_time_in_millis" : 199
            },
            "old" : {
              "collection_count" : 0,
              "collection_time_in_millis" : 0
            }
          }
        },
        "buffer_pools" : {
          "mapped" : {
            "count" : 23,
            "used_in_bytes" : 6232113,
            "total_capacity_in_bytes" : 6232113
          },
          "direct" : {
            "count" : 63,
            "used_in_bytes" : 9050069,
            "total_capacity_in_bytes" : 9050068
          },
          "mapped - 'non-volatile memory'" : {
            "count" : 0,
            "used_in_bytes" : 0,
            "total_capacity_in_bytes" : 0
          }
        },
        "classes" : {
          "current_loaded_count" : 20693,
          "total_loaded_count" : 20693,
          "total_unloaded_count" : 0
        }
      },
      "thread_pool" : {
        "OPENSEARCH_ML_TASK_THREAD_POOL" : {
          "threads" : 0,
          "queue" : 0,
          "active" : 0,
          "rejected" : 0,
          "largest" : 0,
          "completed" : 0
        },
        "ad-batch-task-threadpool" : {
          "threads" : 0,
          "queue" : 0,
          "active" : 0,
          "rejected" : 0,
          "largest" : 0,
          "completed" : 0
        },
        ...
      },
      "fs" : {
        "timestamp" : 1664484195264,
        "total" : {
          "total_in_bytes" : 269490393088,
          "free_in_bytes" : 261251477504,
          "available_in_bytes" : 247490805760
        },
        "data" : [
          {
            "path" : "/usr/share/opensearch/data/nodes/0",
            "mount" : "/ (overlay)",
            "type" : "overlay",
            "total_in_bytes" : 269490393088,
            "free_in_bytes" : 261251477504,
            "available_in_bytes" : 247490805760
          }
        ],
        "io_stats" : { }
      },
      "transport" : {
        "server_open" : 0,
        "total_outbound_connections" : 0,
        "rx_count" : 0,
        "rx_size_in_bytes" : 0,
        "tx_count" : 0,
        "tx_size_in_bytes" : 0
      },
      "http" : {
        "current_open" : 5,
        "total_opened" : 1108
      },
      "breakers" : {
        "request" : {
          "limit_size_in_bytes" : 322122547,
          "limit_size" : "307.1mb",
          "estimated_size_in_bytes" : 0,
          "estimated_size" : "0b",
          "overhead" : 1.0,
          "tripped" : 0
        },
        "fielddata" : {
          "limit_size_in_bytes" : 214748364,
          "limit_size" : "204.7mb",
          "estimated_size_in_bytes" : 356,
          "estimated_size" : "356b",
          "overhead" : 1.03,
          "tripped" : 0
        },
        "in_flight_requests" : {
          "limit_size_in_bytes" : 536870912,
          "limit_size" : "512mb",
          "estimated_size_in_bytes" : 0,
          "estimated_size" : "0b",
          "overhead" : 2.0,
          "tripped" : 0
        },
        "parent" : {
          "limit_size_in_bytes" : 510027366,
          "limit_size" : "486.3mb",
          "estimated_size_in_bytes" : 308650480,
          "estimated_size" : "294.3mb",
          "overhead" : 1.0,
          "tripped" : 0
        }
      },
      "script" : {
        "compilations" : 0,
        "cache_evictions" : 0,
        "compilation_limit_triggered" : 0
      },
      "discovery" : {
        "cluster_state_queue" : {
          "total" : 0,
          "pending" : 0,
          "committed" : 0
        },
        "published_cluster_states" : {
          "full_states" : 2,
          "incompatible_diffs" : 0,
          "compatible_diffs" : 10
        }
      },
      "ingest" : {
        "total" : {
          "count" : 0,
          "time_in_millis" : 0,
          "current" : 0,
          "failed" : 0
        },
        "pipelines" : { }
      },
      "adaptive_selection" : {
        "F-ByTQzVQ3GQeYzQJArJGQ" : {
          "outgoing_searches" : 0,
          "avg_queue_size" : 0,
          "avg_service_time_ns" : 501024,
          "avg_response_time_ns" : 794105,
          "rank" : "0.8"
        }
      },
      "script_cache" : {
        "sum" : {
          "compilations" : 0,
          "cache_evictions" : 0,
          "compilation_limit_triggered" : 0
        },
        "contexts" : [
          {
            "context" : "aggregation_selector",
            "compilations" : 0,
            "cache_evictions" : 0,
            "compilation_limit_triggered" : 0
          },
          {
            "context" : "aggs",
            "compilations" : 0,
            "cache_evictions" : 0,
            "compilation_limit_triggered" : 0
          },
          ...
        ]
      },
      "indexing_pressure" : {
        "memory" : {
          "current" : {
            "combined_coordinating_and_primary_in_bytes" : 0,
            "coordinating_in_bytes" : 0,
            "primary_in_bytes" : 0,
            "replica_in_bytes" : 0,
            "all_in_bytes" : 0
          },
          "total" : {
            "combined_coordinating_and_primary_in_bytes" : 40256,
            "coordinating_in_bytes" : 40256,
            "primary_in_bytes" : 45016,
            "replica_in_bytes" : 0,
            "all_in_bytes" : 40256,
            "coordinating_rejections" : 0,
            "primary_rejections" : 0,
            "replica_rejections" : 0
          },
          "limit_in_bytes" : 53687091
        }
      },
      "shard_indexing_pressure" : {
        "stats" : { },
        "total_rejections_breakup_shadow_mode" : {
          "node_limits" : 0,
          "no_successful_request_limits" : 0,
          "throughput_degradation_limits" : 0
        },
        "enabled" : false,
        "enforced" : false
      }
    }
  }
}

Response fields

The following table lists all response fields.

Field Data Type Description
_nodes Object Statistics about the nodes that are returned.
_nodes.total Integer The total number of nodes for this request.
_nodes.successful Integer The number of nodes for which the request was successful.
_nodes.failed Integer The number of nodes for which the request failed. If there are nodes for which the request failed, the failure message is included.
cluster_name String The name of the cluster.
nodes Object Statistics for the nodes included in this request.

nodes

The nodes object contains all nodes that are returned by the request, along with their IDs. Each node has the following properties.

Field Data Type Description
timestamp Integer The time the nodes statistics were collected, in milliseconds since the epoch.
name String The name of the node.
transport_address IP address The host and port of the transport layer that is used by nodes in a cluster to communicate internally.
host IP address The network host of the node.
ip IP address The IP address and port of the node.
roles Array The roles of the node (for example, cluster_manager, data, or ingest).
attributes Object The attributes of the node (for example, shard_indexing_pressure_enabled).
indices Object Index statistics for each index that has shards on the node.
os Object Statistics about the OS for the node.
process Object Process statistics for the node.
jvm Object Statistics about the JVM for the node.
thread_pool Object Statistics about each thread pool for the node.
fs Object Statistics about the file stores for the node.
transport Object Transport statistics for the node.
http Object HTTP statistics for the node.
http.current_open Integer The number of currently open HTTP connections for the node.
http.total_opened Integer The total number of HTTP connections the node has opened since it started.
breakers Object Statistics about the circuit breakers for the node.
script Object Script statistics for the node.
script_cache Object Script cache statistics for the node.
discovery Object Node discovery statistics for the node.
ingest Object Ingest statistics for the node.
adaptive_selection Object Statistics about adaptive selections for the node.
indexing_pressure Object Statistics related to the node’s indexing pressure.
shard_indexing_pressure Object Statistics related to indexing pressure at the shard level.

indices

The indices object contains the index statistics for each index with shards on this node. Each index has the following properties.

Field Field type Description
docs Object Document statistics for all primary shards that exist on the node.
docs.count Integer The number of documents reported by Lucene. Excludes deleted documents and recently indexed documents that are not yet assigned to a segment. Nested documents are counted separately.
docs.deleted Integer The number of deleted documents reported by Lucene. Excludes recent deletion operations that have not yet affect the segment.
store Object Statistics about the shard sizes of the shards on the node.
store.size_in_bytes Integer Total size of all shards on the node.
store.reserved_in_bytes Integer The predicted number of bytes the shard store will grow to be because of activities such as restoring snapshots and peer recoveries.
indexing Object Statistics about indexing operations for the node.
indexing.index_total Integer The total number of indexing operations on the node.
indexing.index_time_in_millis Integer The total time for all indexing operations, in milliseconds.
indexing.index_current Integer The number of indexing operations that are currently running.
indexing.index_failed Integer The number of indexing operations that have failed.
indexing.delete_total Integer The total number of deletions.
indexing.delete_time_in_millis Integer The total time for all deletion operations, in milliseconds.
indexing.delete_current Integer The number of deletion operations that are currently running.
indexing.noop_update_total Integer The total number of noop operations.
indexing.is_throttled Boolean Specifies whether any operations were throttled.
indexing.throttle_time_in_millis Integer The total time for throttling operations, in milliseconds.
get Object Statistics about the get operations for the node.
get.total Integer The total number of get operations.
get.time_in_millis Integer The total time for all get operations, in milliseconds.
get.exists_total Integer The total number of successful get operations.
get.exists_time_in_millis Integer The total time for all successful get operations, in milliseconds.
get.missing_total Integer The number of failed get operations.
get.missing_time_in_millis Integer The total time for all failed get operations, in milliseconds.
get.current Integer The number of get operations that are currently running.
search Object Statistics about the search operations for the node.
search.open_contexts Integer The number of open search contexts.
search.query_total Integer The total number of query operations.
search.query_time_in_millis Integer The total time for all query operations, in milliseconds.
search.query_current Integer The number of query operations that are currently running.
search.fetch_total Integer The total number of fetch operations.
search.fetch_time_in_millis Integer The total time for all fetch operations, in milliseconds.
search.fetch_current Integer The number of fetch operations that are currently running.
search.scroll_total Integer The total number of scroll operations.
search.scroll_time_in_millis Integer The total time for all scroll operations, in milliseconds.
search.scroll_current Integer The number of scroll operations that are currently running.
search.suggest_total Integer The total number of suggest operations.
search.suggest_time_in_millis Integer The total time for all suggest operations, in milliseconds.
search.suggest_current Integer The number of suggest operations that are currently running.
merges Object Statistics about merge operations for the node.
merges.current Integer The number of merge operations that are currently running.
merges.current_docs Integer The number of document merges that are currently running.
merges.current_size_in_bytes Integer The memory size, in bytes, that is used to perform current merge operations.
merges.total Integer The total number of merge operations.
merges.total_time_in_millis Integer The total time for merges, in milliseconds.
merges.total_docs Integer The total number of documents that have been merged.
merges.total_size_in_bytes Integer The total size of all merged documents, in bytes.
merges.total_stopped_time_in_millis Integer The total time spent on stopping merge operations, in milliseconds.
merges.total_throttled_time_in_millis Integer The total time spent on throttling merge operations, in milliseconds.
merges.total_auto_throttle_in_bytes Integer The total size of automatically throttled merge operations, in bytes.
refresh Object Statistics about refresh operations for the node.
refresh.total Integer The total number of refresh operations.
refresh.total_time_in_millis Integer The total time for all refresh operations, in milliseconds.
refresh.external_total Integer The total number of external refresh operations.
refresh.external_total_time_in_millis Integer The total time for all external refresh operations, in milliseconds.
refresh.listeners Integer The number of refresh listeners.
flush Object Statistics about flush operations for the node.
flush.total Integer The total number of flush operations.
flush.periodic Integer The total number of periodic flush operations.
flush.total_time_in_millis Integer The total time for all flush operations, in milliseconds.
warmer Object Statistics about the index warming operations for the node.
warmer.current Integer The number of current index warming operations.
warmer.total Integer The total number of index warming operations.
warmer.total_time_in_millis Integer The total time for all index warming operations, in milliseconds.
query_cache Statistics about query cache operations for the node.  
query_cache.memory_size_in_bytes Integer The amount of memory used for the query cache for all shards in the node.
query_cache.total_count Integer The total number of hits, misses, and cached queries in the query cache.
query_cache.hit_count Integer The total number of hits in the query cache.
query_cache.miss_count Integer The total number of misses in the query cache.
query_cache.cache_size Integer The size of the query cache, in bytes.
query_cache.cache_count Integer The number of queries in the query cache.
query_cache.evictions Integer The number of evictions in the query cache.
fielddata Object Statistics about the field data cache for all shards in the node.
fielddata.memory_size_in_bytes Integer The total amount of memory used for the field data cache for all shards in the node.
fielddata.evictions Integer The number of evictions in the field data cache.
fielddata.fields Object Contains all field data fields.
completion Object Statistics about completions for all shards in the node.
completion.size_in_bytes Integer The total amount of memory used for completion for all shards in the node, in bytes.
completion.fields Object Contains completion fields.
segments Object Statistics about segments for all shards in the node.
segments.count Integer The total number of segments.
segments.memory_in_bytes Integer The total amount of memory, in bytes.
segments.terms_memory_in_bytes Integer The total amount of memory used for terms, in bytes.
segments.stored_fields_memory_in_bytes Integer The total amount of memory used for stored fields, in bytes.
segments.term_vectors_memory_in_bytes Integer The total amount of memory used for term vectors, in bytes.
segments.norms_memory_in_bytes Integer The total amount of memory used for normalization factors, in bytes.
segments.points_memory_in_bytes Integer The total amount of memory used for points, in bytes.
segments.doc_values_memory_in_bytes Integer The total amount of memory used for doc values, in bytes.
segments.index_writer_memory_in_bytes Integer The total amount of memory used by all index writers, in bytes.
segments.version_map_memory_in_bytes Integer The total amount of memory used by all version maps, in bytes.
segments.fixed_bit_set_memory_in_bytes Integer The total amount of memory used by fixed bit sets, in bytes. Fixed bit sets are used for nested objects and join fields.
segments.max_unsafe_auto_id_timestamp Integer The timestamp for the most recently retired indexing request, in milliseconds since the epoch.
segments.file_sizes Integer Statistics about the size of the segment files.
translog Object Statistics about transaction log operations for the node.
translog.operations Integer The number of translog operations.
translog.size_in_bytes Integer The size of the translog, in bytes.
translog.uncommitted_operations Integer The number of uncommitted translog operations.
translog.uncommitted_size_in_bytes Integer The size of uncommitted translog operations, in bytes.
translog.earliest_last_modified_age Integer The earliest last modified age for the translog.
request_cache Object Statistics about the request cache for the node.
request_cache.memory_size_in_bytes Integer The memory size used by the request cache, in bytes.
request_cache.evictions Integer The number of request cache evictions.
request_cache.hit_count Integer The number of request cache hits.
request_cache.miss_count Integer The number of request cache misses.
recovery Object Statistics about recovery operations for the node.
recovery.current_as_source Integer The number of recovery operations that have used an index shard as a source.
recovery.current_as_target Integer The number of recovery operations that have used an index shard as a target.
recovery.throttle_time_in_millis Integer The delay of recovery operations due to throttling, in milliseconds.

os

The os object has the OS statistics for the node and has the following properties.

Field Field type Description
timestamp Integer The last refresh time for the OS statistics, in milliseconds since the epoch.
cpu Object Statistics about the node’s CPU usage.
cpu.percent Integer Recent CPU usage for the system.
cpu.load_average Object Statistics about load averages for the system.
cpu.load_average.1m Float The load average for the system for the time period of one minute.
cpu.load_average.5m Float The load average for the system for the time period of five minutes.
cpu.load_average.15m Float The load average for the system for the time period of 15 minutes.
cpu.mem Object Statistics about memory usage for the node.
cpu.mem.total_in_bytes Integer The total amount of physical memory, in bytes.
cpu.mem.free_in_bytes Integer The total amount of free physical memory, in bytes.
cpu.mem.used_in_bytes Integer The total amount of used physical memory, in bytes.
cpu.mem.free_percent Integer The percentage of memory that is free.
cpu.mem.used_percent Integer The percentage of memory that is used.
cpu.swap Object Statistics about swap space for the node.
cpu.swap.total_in_bytes Integer The total amount of swap space, in bytes.
cpu.swap.free_in_bytes Integer The total amount of free swap space, in bytes.
cpu.swap.used_in_bytes Integer The total amount of used swap space, in bytes.
cpu.cgroup Object Contains cgroup statistics for the node. Returned for Linux only.
cpu.cgroup.cpuacct Object Statistics about the cpuacct control group for the node.
cpu.cgroup.cpu Object Statistics about the CPU control group for the node.
cpu.cgroup.memory Object Statistics about the memory control group for the node.

process

The process object contains process statistics for the node and has the following properties.

Field Field type Description
timestamp Integer The last refresh time for the process statistics, in milliseconds since the epoch.
open_file_descriptors Integer The number of opened file descriptors associated with the current process.
max_file_descriptors Integer The maximum number of file descriptors for the system.
cpu Object Statistics about the CPU for the node.
cpu.percent Integer The percentage of CPU usage for the process.
cpu.total_in_millis Integer The total CPU time used by the process on which the JVM is running, in milliseconds.
mem Object Statistics about the memory for the node.
mem.total_virtual_in_bytes Integer The total amount of virtual memory that is guaranteed to be available to the process that is currently running, in bytes.

jvm

The jvm object contains statistics about the JVM for the node and has the following properties.

Field Field type Description
timestamp Integer The last refresh time for the JVM statistics, in milliseconds since the epoch.
uptime_in_millis Integer The JVM uptime, in milliseconds.
mem Object Statistics for the JVM memory usage on the node.
mem.heap_used_in_bytes Integer The amount of memory that is currently being used, in bytes.
mem.heap_used_percent Integer The percentage of memory that is currently used by the heap.
mem.heap_committed_in_bytes Integer The amount of memory available for use by the heap, in bytes.
mem.heap_max_in_bytes Integer The maximum amount of memory available for use by the heap, in bytes.
mem.non_heap_used_in_bytes Integer The amount of non-heap memory that is currently used, in bytes.
mem.non_heap_committed_in_bytes Integer The maximum amount of non-heap memory available for use, in bytes.
mem.pools Object Statistics about heap memory usage for the node.
mem.pools.young Object Statistics about the young generation heap memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
mem.pools.old Object Statistics about the old generation heap memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
mem.pools.survivor Object Statistics about the survivor space memory usage for the node. Contains the amount of memory used, the maximum amount of memory available, and the peak amount of memory used.
threads Object Statistics about the JVM thread usage for the node.
threads.count Integer The number of threads that are currently active in the JVM.
threads.peak_count Integer The maximum number of threads in the JVM.
gc.collectors Object Statistics about the JVM garbage collectors for the node.
gc.collectors.young Integer Statistics about JVM garbage collectors that collect young generation objects.
gc.collectors.young.collection_count Integer The number of garbage collectors that collect young generation objects.
gc.collectors.young.collection_time_in_millis Integer The total time spent on garbage collection of young generation objects, in milliseconds.
gc.collectors.old Integer Statistics about JVM garbage collectors that collect old generation objects.
gc.collectors.old.collection_count Integer The number of garbage collectors that collect old generation objects.
gc.collectors.old.collection_time_in_millis Integer The total time spent on garbage collection of old generation objects, in milliseconds.
buffer_pools Object Statistics about the JVM buffer pools for the node.
buffer_pools.mapped Object Statistics about the mapped JVM buffer pools for the node.
buffer_pools.mapped.count Integer The number of mapped buffer pools.
buffer_pools.mapped.used_in_bytes Integer The amount of memory used by mapped buffer pools, in bytes.
buffer_pools.mapped.total_capacity_in_bytes Integer The total capacity of the mapped buffer pools, in bytes.
buffer_pools.direct Object Statistics about the direct JVM buffer pools for the node.
buffer_pools.direct.count Integer The number of direct buffer pools.
buffer_pools.direct.used_in_bytes Integer The amount of memory used by direct buffer pools, in bytes.
buffer_pools.direct.total_capacity_in_bytes Integer The total capacity of the direct buffer pools, in bytes.
classes Object Statistics about the classes loaded by the JVM for the node.
classes.current_loaded_count Integer The number of classes currently loaded by the JVM.
classes.total_loaded_count Integer The total number of classes loaded by the JVM since it started.
classes.total_unloaded_count Integer The total number of classes unloaded by the JVM since it started.

thread_pool

The thread_pool object contains a list of all thread pools. Each thread pool is a nested object specified by its ID with the properties listed below.

Field Field type Description
threads Integer The number of threads in the pool.
queue Integer The number of threads in queue.
active Integer The number of active threads in the pool.
rejected Integer The number of tasks that have been rejected.
largest Integer The peak number of threads in the pool.
completed Integer The number of tasks completed.

fs

The fs object represents statistics about the file stores for the node. It has the following properties.

Field Field type Description
timestamp Integer The last refresh time for the file store statistics, in milliseconds since the epoch.
total Object Statistics for all file stores of the node.
total.total_in_bytes Integer The total memory size of all file stores, in bytes.
total.free_in_bytes Integer The total unallocated disk space in all file stores, in bytes.
total.available_in_bytes Integer The total disk space available to the JVM on all file stores. Represents the actual amount of memory, in bytes, that OpenSearch can use.
data Array The list of all file stores. Each file store has the properties listed below.
data.path String The path to the file store.
data.mount String The mount point of the file store.
data.type String The type of the file store (for example, overlay).
data.total_in_bytes Integer The total size of the file store, in bytes.
data.free_in_bytes Integer The total unallocated disk space in the file store, in bytes.
data.available_in_bytes Integer The total amount of disk space available to the JVM for the file store, in bytes.
io_stats Object I/O statistics for the node (Linux only). Includes devices, read and write operations, and the I/O operation time.

transport

The transport object has the following properties.

Field Field type Description
server_open Integer The number of open inbound TCP connections that OpenSearch nodes use for internal communication.
total_outbound_connections Integer The total number of outbound transport connections that the node has opened since it started.
rx_count Integer The total number of RX (receive) packets the node received during internal communication.
rx_size_in_bytes Integer The total size of RX packets the node received during internal communication, in bytes.
tx_count Integer The total number of TX (transmit) packets the node sent during internal communication.
tx_size_in_bytes Integer The total size of TX (transmit) packets the node sent during internal communication, in bytes.

breakers

The breakers object contains statistics about the circuit breakers for the node. Each circuit breaker is a nested object listed by name and contains the following properties.

Field Field type Description
limit_size_in_bytes Integer The memory limit for the circuit breaker, in bytes.
limit_size Byte value The memory limit for the circuit breaker in human-readable format (for example, 307.1mb).
estimated_size_in_bytes Integer The estimated memory used for the operation, in bytes.
estimated_size Byte value The estimated memory used for the operation in human-readable format (for example, 356b).
overhead Float A factor that all estimates are multiplied by to calculate the final estimate.
tripped Integer The total number of times the circuit breaker has been activated to prevent an out-of-memory error.

script and script_cache

The script and script_cache objects have the following properties.

Field Field type Description
script Object Script statistics for the node.
script.compilations Integer The total number of script compilations for the node.
script.cache_evictions Integer The total number of times the script cache has purged old data.
script.compilation_limit_triggered Integer The total number of times script compilation was limited by a circuit breaker.
script_cache Object Script cache statistics for the node.
script_cache.sum.compilations Integer The total number of script compilations in the cache for the node.
script_cache.sum.cache_evictions Integer The total number of times the script cache has purged old data.
script_cache.sum.compilation_limit_triggered Integer The total number of times script compilation in the cache was limited by a circuit breaker.
script_cache.contexts Array of objects The list of contexts for the script cache. Each context contains its name, the number of compilations, the number of cache evictions, and the number of times the script was limited by a circuit breaker.

discovery

The discovery object contains the node discovery statistics and has the following properties.

Field Field type Description
cluster_state_queue Object Cluster state queue statistics for the node.
cluster_state_queue.total Integer The total number of cluster states in the queue.
cluster_state_queue.pending Integer The number of pending cluster states in the queue.
cluster_state_queue.committed Integer The number of committed cluster states in the queue.
published_cluster_states Object Statistics for the published cluster states for the node.
published_cluster_states.full_states Integer The number of published cluster states.
published_cluster_states.incompatible_diffs Integer The number of incompatible differences between published cluster states.
published_cluster_states.compatible_diffs Integer The number of compatible differences between published cluster states.

ingest

The ingest object contains the ingest statistics and has the following properties.

Field Field type Description
total Integer Ingest statistics for the node’s lifetime.
total.count Integer The total number of documents ingested by the node.
total.time_in_millis Integer The total amount of time for preprocessing ingest documents, in milliseconds.
total.current Integer The total number of documents that are currently being ingested by the node.
total.failed Integer The total number of failed ingestions for the node.
pipelines Object Ingest pipeline statistics for the node. Each pipeline is a nested object specified by its ID with the properties listed below.
pipelines.id.count Integer The number of documents preprocessed by the ingest pipeline.
pipelines.id.time_in_millis Integer The total amount of time for preprocessing documents in the ingest pipeline, in milliseconds.
pipelines.id.failed Integer The total number of failed ingestions for the ingest pipeline.
pipelines.id.processors Array of objects Statistics for the ingest processors. Includes the number of documents that are currently transformed, the total number of transformed documents, the number of failed transformations, and the time spent transforming documents.

adaptive_selection

The adaptive_selection object contains the adaptive selection statistics. Each entry is specified by the node ID and has the properties listed below.

Field Field type Description
outgoing_searches Integer The number of outgoing search requests for the node.
avg_queue_size Integer The rolling average queue size of search requests for the node (exponentially weighted).
avg_service_time_ns Integer The rolling average service time for search requests, in nanoseconds (exponentially weighted).
avg_response_time_ns Integer The rolling average response time for search requests, in nanoseconds (exponentially weighted).
rank String The node’s rank that is used to select shards when routing requests.

indexing_pressure

The indexing_pressure object contains the indexing pressure statistics and has the following properties.

Field Field type Description
memory Object Statistics related to memory consumption for the indexing load.
memory.current Object Statistics related to memory consumption for the current indexing load.
memory.current.combined_coordinating_and_primary_in_bytes Integer The total memory used by indexing requests in the coordinating or primary stages, in bytes. A node can reuse the coordinating memory if the primary stage is run locally, so the total memory does not necessarily equal the sum of the coordinating and primary stage memory usage.
memory.current.coordinating_in_bytes The total memory consumed by indexing requests in the coordinating stage, in bytes.  
memory.current.primary_in_bytes Integer The total memory consumed by indexing requests in the primary stage, in bytes.
memory.current.replica_in_bytes Integer The total memory consumed by indexing requests in the replica stage, in bytes.
memory.current.all_in_bytes Integer The total memory consumed by indexing requests in the coordinating, primary, or replica stages.

shard_indexing_pressure

The shard_indexing_pressure object contains the shard indexing pressure statistics and has the following properties.

Field Field type Description
stats Object Statistics about shard indexing pressure.
total_rejections_breakup_shadow_mode Object If running in shadow mode, the total_rejections_breakup_shadow_mode object contains statistics about the request rejection criteria of all shards in the node.
total_rejections_breakup_shadow_mode.node_limits Integer The total number of rejections due to the node memory limit. When all shards reach the memory limit assigned to the node (for example, 10% of heap size), the shard is unable to take in more traffic on the node, and the indexing request is rejected.
total_rejections_breakup_shadow_mode.no_successful_request_limits Integer The total number of rejections when the node occupancy level is breaching its soft limit and the shard has multiple outstanding requests that are waiting to be executed. In this case, additional indexing requests are rejected until the system recovers.
total_rejections_breakup_shadow_mode.throughput_degradation_limits Integer The total number of rejections when the node occupancy level is breaching its soft limit and there is a constant deterioration in the request turnaround at the shard level. In this case, additional indexing requests are rejected until the system recovers.
enabled Boolean Specifies whether the shard indexing pressure feature is turned on for the node.
enforced Boolean If true, the shard indexing pressure runs in enforced mode (there are rejections). If false, the shard indexing pressure runs in shadow mode (there are no rejections, but statistics are recorded and can be retrieved in the total_rejections_breakup_shadow_mode object). Only applicable if shard indexing pressure is enabled.

Required permissions

If you use the security plugin, make sure you have the appropriate permissions: cluster:monitor/nodes/stats.

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