{
   "cluster_name":          "elasticsearch",
   "status":                "green", <1>
   "number_of_nodes":       1,
   "number_of_data_nodes":  1,
   "active_primary_shards": 0,
   "relocating_shards":     0,
   "unassigned_shards":     0

• <1> status 是我们最感兴趣的字段