output

curl -X GET "localhost:9200/"
{
  "name" : "node-1",
  "cluster_name" : "Demo-elasticsearch",
  "cluster_uuid" : "ylRzxEcBRZSQY9WY0vRKnQ",
  "version" : {
    "number" : "6.5.4",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "d2ef93d",
    "build_date" : "2018-12-17T21:17:40.758843Z",
    "build_snapshot" : false,
    "lucene_version" : "7.5.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

curl -X GET "localhost:9200/_cat/nodes?v"
ip             heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
10.249.186.101           18          96  12    0.18    0.34     0.43 mdi       *      node-1

curl -X GET "localhost:9200/_cat/health?v"
epoch      timestamp cluster            status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1563348249 07:24:09  Demo-elasticsearch green           1         1      0   0    0    0        0             0                  -                100.0%

curl -X GET "localhost:9200/_cat/indices?v"
health status index uuid pri rep docs.count docs.deleted store.size pri.store.size