anchor.diff:  [source,js]
   --------------------------------------------------
   {
  -    category: {
  -        type:      "string",
  -        fielddata: {
  -            loading: "eager_global_ordinals"
  +    "category": {
  +        "type":      "string",
  +        "fielddata": {
  +            "loading": "eager_global_ordinals"
           }
       }
   }
  
positive.code: [source,js]
  --------------------------------------------------
  {
      tweet: {
          type:      "string",
          analyzer:  "whitespace"
          fielddata: {
              filter: {
                  regex: {
                      pattern:          "^#.*",
                  },
                  frequency: {
                      min:              0.001,
                      max:              0.1,
                      min_segment_size: 500
                  }
              }
          }
  
negative.code: [source,js]
  --------------------------------------------------
  {
      "tag": {
          "type":      "string",
          "fielddata": {
              "filter": {
                  "frequency": {
                      "min":              0.001,
                      "max":              0.1,
                      "min_segment_size": 500
                  }
              }
          }
  