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Cluster health

Introduced 1.0 {: .label .label-purple }

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.

expand_wildcardsEnumExpands wildcard expressions to concrete indexes. Combine multiple values with commas. Supported values are all, open, closed, hidden, and none. Default is open.
levelEnumThe level of detail for returned health information. Supported values are cluster, indices, and shards. Default is cluster.
localBooleanWhether to return information from the local node only instead of from the cluster manager node. Default is false.
cluster_manager_timeoutTimeThe amount of time to wait for a connection to the cluster manager node. Default is 30 seconds.
timeoutTimeThe amount of time to wait for a response. If the timeout expires, the request fails. Default is 30 seconds.
wait_for_active_shardsStringWait until the specified number of shards is active before returning a response. all for all shards. Default is 0.
wait_for_nodesStringWait for N number of nodes. Use 12 for exact match, >12 and <12 for range.
wait_for_eventsEnumWait 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_shardsBooleanWhether to wait until there are no relocating shards in the cluster. Default is false.
wait_for_no_initializing_shardsBooleanWhether to wait until there are no initializing shards in the cluster. Default is false.
wait_for_statusEnumWait until the cluster health reaches the specified status 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,
  "discovered_master" : true,
  "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

Required permissions

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

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