elasticsearchHow do I check the status of my Elasticsearch cluster?

To check the status of an Elasticsearch cluster, you can use the Cluster Health API.

Example request:

curl -XGET 'localhost:9200/_cluster/health?pretty'

Example output:

{
  "cluster_name" : "elasticsearch_jdoe",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 3,
  "number_of_data_nodes" : 3,
  "active_primary_shards" : 8,
  "active_shards" : 16,
  "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
}

The output of the request above will provide the following information:

• cluster_name: The name of the cluster.
• status: The current status of the cluster. Possible values are green, yellow, or red.
• timed_out: Whether the request timed out or not.
• number_of_nodes: The number of nodes in the cluster.
• number_of_data_nodes: The number of data nodes in the cluster.
• active_primary_shards: The number of active primary shards in the cluster.
• active_shards: The number of active shards in the cluster.
• relocating_shards: The number of relocating shards in the cluster.
• initializing_shards: The number of initializing shards in the cluster.
• unassigned_shards: The number of unassigned shards in the cluster.
• delayed_unassigned_shards: The number of delayed unassigned shards in the cluster.
• number_of_pending_tasks: The number of pending tasks in the cluster.
• number_of_in_flight_fetch: The number of in-flight fetch operations in the cluster.
• task_max_waiting_in_queue_millis: The maximum waiting time for tasks in the queue in milliseconds.
• active_shards_percent_as_number: The percentage of active shards in the cluster.

For more information on the Cluster Health API, please refer to the Elasticsearch documentation.

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