Elasticsearch: Cluster Health

You can get cluster health by using cluster health API.
GET _cluster/health

Response like below.

{
   "cluster_name": "cluster_sample",
   "status": "yellow",
   "timed_out": false,
   "number_of_nodes": 1,
   "number_of_data_nodes": 1,
   "active_primary_shards": 6,
   "active_shards": 6,
   "relocating_shards": 0,
   "initializing_shards": 0,
   "unassigned_shards": 6
}

"cluster_name": "cluster_sample"

Cluster name represents name of the cluster, here my cluster name is "cluster_sample".

"status": "yellow"

Status is green/yellow/red

Status	description
green	All primary and replica shards are ready and your cluster is fully operational.
yellow	All primary shards are ready, some (or) all replica shards are not ready.
red	Some (or) all primary shards are not ready

"number_of_data_nodes": 1

Represents number of data nodes, currently it is 1.

"active_primary_shards": 6

Represents number of active primary shard in your cluster.

"active_shards": 6

It is sum of total primary and replica shards.

"relocating_shards": 0

Number of shards that are moving from one node to another.

"initializing_shards": 0

Number of shards that are freshly created.

"unassigned_shards": 6

unassigned shards are actually unassigned replicas of your actual shards from the master node.

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