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Cluster health

Introduced 1.0

The most basic cluster health request returns a simple status of the health of your cluster. OpenSearch expresses cluster health in three colors: green, yellow, and red. A green status means all primary shards and their replicas are allocated to nodes. A yellow status means all primary shards are allocated to nodes, but some replicas aren’t. A red status means at least one primary shard is not allocated to any node.

To get the status of a specific index, provide the index name.


This request waits 50 seconds for the cluster to reach the yellow status or better:

GET _cluster/health?wait_for_status=yellow&timeout=50s

If the cluster health becomes yellow or green before 50 seconds elapse, it returns a response immediately. Otherwise it returns a response as soon as it exceeds the timeout.

Path and HTTP methods

GET _cluster/health
GET _cluster/health/<index>

URL parameters

All cluster health parameters are optional.

Parameter Type Description
expand_wildcards Enum Expands wildcard expressions to concrete indices. Combine multiple values with commas. Supported values are all, open, closed, hidden, and none. Default is open.
level Enum The level of detail for returned health information. Supported values are cluster, indices, and shards. Default is cluster.
local Boolean Whether to return information from the local node only instead of from the master node. Default is false.
master_timeout Time The amount of time to wait for a connection to the master node. Default is 30 seconds.
timeout Time The amount of time to wait for a response. If the timeout expires, the request fails. Default is 30 seconds.
wait_for_active_shards String Wait until the specified number of shards is active before returning a response. all for all shards. Default is 0.
wait_for_events Enum Wait until all currently queued events with the given priority are processed. Supported values are immediate, urgent, high, normal, low, and languid.
wait_for_no_relocating_shards Boolean Whether to wait until there are no relocating shards in the cluster. Default is false.
wait_for_no_initializing_shards Boolean Whether to wait until there are no initializing shards in the cluster. Default is false.
wait_for_status Enum Wait until the cluster is in a specific state or better. Supported values are green, yellow, and red.


  "cluster_name" : "opensearch-cluster",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 2,
  "number_of_data_nodes" : 2,
  "active_primary_shards" : 6,
  "active_shards" : 12,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 0,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 100.0