curl -XGET ‘localhost:9200/_cat/health?v&pretty’
可以 查询到集群的 状态 节点数
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1475871424 16:17:04 elasticsearch green 1 1 5 5 0 0 0 0 - 100.0%