anchor.diff:  
   `text`:: 
       Sets the text / query to provide suggestions for.
  +
  +`highlight`::
  +    Sets up suggestion highlighting.  If not provided then 
  +    no `highlighted` field is returned.  If provided must 
  +    contain exactly `pre_tag` and `post_tag` which are 
  +    wrapped around the changed tokens.  If multiple tokens 
  +    in a row are changed the entire phrase of changed tokens 
  +    is wrapped rather than each token.
   
   ==== Smoothing Models
   
  
positive.code:       "length" : 17,
        "options" : [ {
          "text" : "xorr the god jewel",
          "score" : 0.17877324
        }, {
          "text" : "xor the god jewel",
          "score" : 0.14231323
        } ]
      } ]
  
negative.code:           "field" : "body",
            "suggest_mode" : "always",
            "min_word_len" : 1
          } ],
          "highlight": {
            "pre_tag": "<em>",
            "post_tag": "</em>"
          }
        }
      }
    }
  