Elasticsearch之CURL命令的HEAD

　　如果只想检查一些文档是否存在，我们可以使用HEAD来替代GET方法，这样就只会返回HTTP头文件。

[hadoop@master elasticsearch-2.4.]$ curl -i XHEAD http://master:9200/zhouls/user/1
curl: () Couldn't resolve host 'XHEAD'
HTTP/1.1  OK
Content-Type: application/json; charset=UTF-
Content-Length: 

{"_index":"zhouls","_type":"user","_id":"","_version":,"found":true,"_source":{"name" : "john"  , "age" : }}[hadoop@master elasticsearch-2.4.]$
[hadoop@master elasticsearch-2.4.]$