anchor.diff:  curl 'localhost:9200/_cat/indices?v'
   --------------------------------------------------
   
  -And the response:
  +其返回结果如下:
   
   [source,sh]
   --------------------------------------------------
  
positive.code: }'
  --------------------------------------------------
  
  In the above example, the `bool should` clause specifies a list of queries either of which must be true for a document to be considered a match.
  
  This example composes two `match` queries and returns all accounts that contain neither "mill" nor "lane" in the address:
  
  [source,sh]
  --------------------------------------------------
  
negative.code: }
  --------------------------------------------------
  
  上面的返回结果中除了 `found` 字段以外没有其它与众不同的地方, 它声明了我们成功找到带有请求ID值为1的一个文档。另外一个字段 `_source`, 它返回的是我们在之前的步骤中索引过的整个的JSON文档.
  
  === 删除索引
  
  现在我们删除刚创建的索引, 然后再次列举出所有的索引:
  
  [source,sh]
  --------------------------------------------------
  