anchor.diff:        "order": "asc",
         "script": {
           "lang": "painless",
  -        "source": "doc['first.keyword'].value + ' ' + doc['last.keyword'].value"
  +        "inline": "doc['first.keyword'].value + ' ' + doc['last.keyword'].value"
         }
       }
     }
  
positive.code: {
    "script": {
      "lang": "painless",
      "source": "ctx._source.last = /n([aeiou])/.matcher(ctx._source.last).replaceAll('$1')"
    }
  }
  ----------------------------------------------------------------
  
negative.code:   "script_fields": {
      "birth_year": {
        "script": {
          "inline": "doc.born.date.year"
        }
      }
    }
  