anchor.diff:          "bool": {
             "must": [
               { "match": { "user.first": "Alice" }},
  -            { "match": { "user.last":  "Smith" }} <3>
  +            { "match": { "user.last":  "White" }} <3>
             ]
           }
         },
  
positive.code:         "bool": {
            "must": [
              { "match": { "user.first": "Alice" }},
              { "match": { "user.last":  "White" }} <2>
            ]
          }
        }
  
negative.code:             "user.first": {}
            }
          }
  
      }
    }
  }
  --------------------------------------------------
  // AUTOSENSE
  <1> The `user` field is mapped as type `nested` instead of type `object`.
  <2> This query doesn't match because `Alice` and `Smith` are not in the same nested object.
  <3> This query matches because `Alice` and `White` are in the same nested object.
  <4> `inner_hits` allow us to highlight the matching nested documents.
  
  