GET twitter/_validate/query?q=user:foo返回
{"valid":true,"_shards":{"total":1,"successful":1,"failed":0}},如果参数格式不正确,则valid为false
GET twitter/_validate/query?q=user:foo返回
{"valid":true,"_shards":{"total":1,"successful":1,"failed":0}},如果参数格式不正确,则valid为false