anchor.diff:  --------------------------------------------------
   {
       "aggs" : {
  -        "genders" : {
  -            "terms" : {
  -                "field" : "gender",
  +        "genres" : {
  +            "terms" : {
  +                "field" : "genre",
                   "order" : { "_count" : "asc" }
               }
           }
  
positive.code: --------------------------------------------------
  {
      "aggs" : {
          "genders" : {
              "terms" : {
                  "field" : "gender",
                  "order" : { "_term" : "asc" }
              }
          }
  
negative.code:     ...
  
      "aggregations" : {
          "genres" : {
              "doc_count_error_upper_bound": 0, <1>
              "sum_other_doc_count": 0, <2>
              "buckets" : [ <3>
                  {
                      "key" : "jazz",
                      "doc_count" : 10
                  },
                  {
                      "key" : "rock",
                      "doc_count" : 10
                  },
                  {
                      "key" : "electronic",
                      "doc_count" : 10
                  },
              ]
  