anchor.diff:  --------------------------------------------------
   {
       "has_child" : {
  -        "child_type" : "blog_tag",
  +        "type" : "blog_tag",
           "score_mode" : "min",
           "query" : {
               "term" : {
  
positive.code: --------------------------------------------------
  {
      "has_child" : {
          "child_type" : "blog_tag",
          "score_mode" : "min",
          "min_children": 2, <1>
          "max_children": 10, <1>
  
negative.code: --------------------------------------------------
  {
      "has_child" : {
          "type" : "blog_tag",
          "query" : {
              "term" : {
                  "tag" : "something"
  