1.5.8 删除文档

请求：DELETE http://127.0.0.1:9200/secisland/secilog/1/

返回值：

{
  "found": true， 
  "_index": "secisland"， 
  "_type": "secilog"， 
  "_id": "1"， 
  "_version": 3， 
  "_shards": {"total": 2， "successful": 1， "failed": 0}
}