elasticsearchHow do I use cURL to perform an Elasticsearch health check?

To perform an Elasticsearch health check using cURL, you can use the following example code:

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

The output of the command will show the health of the cluster, such as the status (green, yellow, or red), the number of nodes, and the number of data nodes:

{
  "cluster_name" : "elasticsearch",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 3,
  "number_of_data_nodes" : 2,
  "active_primary_shards" : 5,
  "active_shards" : 10,
  "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 code consists of the following parts:

• curl - the command line tool used to make the request
• -XGET - the type of request to make (in this case, a GET request)
• localhost:9200 - the host and port of the Elasticsearch cluster
• _cluster/health - the endpoint to hit for the health check
• ?pretty - an optional parameter to make the output more readable

For more information about using cURL to perform an Elasticsearch health check, see this page.

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