Enabled property not working for dynamic string type fields

[Surabhi_Prasad]

I have been trying to create an index which would not index any field if no dynamic/implicit template is defined for a field.

PUT http://localhost:9200/test1

{
   "mappings": {
      "my_type": {
         "dynamic_templates": [
            {
               "indexed": {
                  "path_match": "indexed.*",
                  "match_mapping_type": "string",
                  "mapping": {
                     "type": "keyword"
                  }
               }
            },
            {
               "others": {
                  "path_match": "others.*",
                  "match_mapping_type": "string",
                  "mapping": {                     
                     "enabled": false
                  }
               }
            }
         ]
      }
   }
}

As per the above setting the below document should get indexed, but it throws error:

POST http://localhost:9200/test1/my_type

{
   "indexed": {
      "a": "c"
   },
   "others": {
      "somerandome": "qqqss",
      "somerandome.www": "qqqss"
      
   }
}

Error:

{
   "error": {
      "root_cause": [
         {
            "type": "illegal_argument_exception",
            "reason": "Can't merge a non object mapping [others.somerandome] with an object mapping [others.somerandome]"
         }
      ],
      "type": "illegal_argument_exception",
      "reason": "Can't merge a non object mapping [others.somerandome] with an object mapping [others.somerandome]"
   },
   "status": 400
}

Also, looking at the code, it seems i can only use enabled:false for object type fields.

Also tried creating static template for a keyword type field as enabled:false and got error.

PUT http://localhost:9200/test2

   {
      "mappings": {
         "my_type": {         
            "properties": {
               "others": {
                  "type": "object",
                  "properties": {
                     "somerandome": {
                        "type": "keyword",
                        "enabled": false
                     }
                  }
               }
            }
         }
      }
   }

Error:

{
   "error": {
      "root_cause": [
         {
            "type": "mapper_parsing_exception",
            "reason": "Mapping definition for [somerandome] has unsupported parameters:  [enabled : false]"
         }
      ],
      "type": "mapper_parsing_exception",
      "reason": "Failed to parse mapping [my_type]: Mapping definition for [somerandome] has unsupported parameters:  [enabled : false]",
      "caused_by": {
         "type": "mapper_parsing_exception",
         "reason": "Mapping definition for [somerandome] has unsupported parameters:  [enabled : false]"
      }
   },
   "status": 400
}