anchor.diff:  --------------------------------------------------
   {
       "aggs" : {
  -        "genders" : {
  -            "terms" : {
  -                "field" : "gender",
  -                "order" : { "height_stats.avg" : "desc" }
  +        "genres" : {
  +            "terms" : {
  +                "field" : "genre",
  +                "order" : { "playback_stats.avg" : "desc" }
               },
               "aggs" : {
  -                "height_stats" : { "stats" : { "field" : "height" } }
  +                "playback_stats" : { "stats" : { "field" : "play_count" } }
               }
           }
       }
  
positive.code: --------------------------------------------------
  {
      "aggs" : {
          "genders" : {
              "terms" : {
                  "script" : "doc['gender'].value"
              }
          }
      }
  
negative.code: --------------------------------------------------
  {
      "aggs" : {
          "genres" : {
              "terms" : {
                  "field" : "genre",
                  "script" : "'Genre: ' +_value"
              }
          }
      }
  