anchor.diff:      "body": {
         "query":            "nelly the elephant as a cartoon",
         "cutoff_frequency": 0.001,
  -      "low_freq_operator" "and"
  +      "low_freq_operator": "and"
       }
     }
   }
  
positive.code:       }
      },
      "should": [
        { "term": { "body": "the"}}
        { "term": { "body": "as"}}
        { "term": { "body": "a"}}
      ]
    }
  
negative.code:       { "term": { "body": "cartoon"}}
      ],
      "should": [
        { "term": { "body": "the"}},
        { "term": { "body": "as"}},
        { "term": { "body": "a"}}
      ]
    }
  