elasticsearch集群健康状态查看

https://localhost:9200/_cluster/health?pretty
响应：
{
  "cluster_name" : "if2c",
  "status" : "yellow",   //集群的状态红绿灯，绿：健康，黄：亚健康，红：病态
  "timed_out" : false,
  "number_of_nodes" : 1, //节点数
  "number_of_data_nodes" : 1, //数据节点数
  "active_primary_shards" : 3, //分片数，3个Index库
  "active_shards" : 3,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 3  //未指定节点，配置了复本，仅使用一台机器部署会出现这种情况
}https://localhost:9200/_clu