Adding new field using an existing field?

Elastic Stack Elasticsearch
1

I have my mapping as follows:

 {
  "payment_transaction": {
    "mappings": {
      "message_logs": {
        "properties": {
          "@timestamp": {
            "type": "date"
          },
          "changed_date": {
            "type": "date"
          },
          "created_date": {
            "type": "date"
          }
        }
      }
    }
  }
}

And I need to create new three fields such as (year,month,day) where the value of (created_date) should be trimmed and assigned as in a following manner:

year=2016
month=11
day=22

The format of the created_date looks like 2016-11-22T22:20:21.000Z.

Is this possible? Any help could be appreciated.

2

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