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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.
Example
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. |
Response
{
"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
}