"filed_one": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          },
          "regexkeyword": {
            "type": "keyword",
            "normalizer": "lowercase_normalizer"
          }
        },
        "analyzer": "simple"
      },
     "filed_two": {
        "type": "text",
        "fields": {
          "keyword": {
            "type": "keyword",
            "ignore_above": 256
          },
          "regexkeyword": {
            "type": "keyword",
            "normalizer": "lowercase_normalizer"
          }
        },
        "analyzer": "simple"
      }

{
 "script_fields": {
     "adas": {
        "script": {
           "inline": "'field_one.keyword' == 'field_two.keyword'",
           "lang": "painless"
         }
     }
 }