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