Field aliases in search results

Elastic Stack Elasticsearch
1

The field aliases in search results show the original field names and not aliases.

How do we get the alias field names in the search result.

Ex:

    PUT myindex
    {
      "mappings": {
          "properties": {
            "firstname": {
              "type": "text"
            },
            "fn": {
              "type": "alias",
              "path": "firstname" 
            }
        }
      }
    }

    POST myindex/_doc
    {
      "firstname": "hello"
    }

    GET myindex/_search
    {
      "query": {
        "match": {
          "fn": "hello"
        }
      }
    }

In the result we get the below output.

  {
      "took" : 0,
      "timed_out" : false,
      "_shards" : {
        "total" : 1,
        "successful" : 1,
        "skipped" : 0,
        "failed" : 0
      },
      "hits" : {
        "total" : {
          "value" : 1,
          "relation" : "eq"
        },
        "max_score" : 0.6931471,
        "hits" : [
          {
            "_index" : "myindex",
            "_type" : "_doc",
            "_id" : "uxp7vnIBJVpfmbc3lqnD",
            "_score" : 0.6931471,
            "_source" : {
              "firstname" : "hello"
            }
          }
        ]
      }
    }

How do we get a result like this:

  {
      "took" : 0,
      "timed_out" : false,
      "_shards" : {
        "total" : 1,
        "successful" : 1,
        "skipped" : 0,
        "failed" : 0
      },
      "hits" : {
        "total" : {
          "value" : 1,
          "relation" : "eq"
        },
        "max_score" : 0.6931471,
        "hits" : [
          {
            "_index" : "myindex",
            "_type" : "_doc",
            "_id" : "uxp7vnIBJVpfmbc3lqnD",
            "_score" : 0.6931471,
            "_source" : {
              "fn" : "hello"
            }
          }
        ]
      }
    }
2

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