Converting date format in logstash

[Melvin_Moses]

I have to extract a date from a log file, need to convert it to another date format and save it to Elasticsearch. My logstash code is like this

filter {
grok{
patterns_dir => "./patterns"
match => [ "message", "%{pattern:timestamp} %{GREEDYDATA:message}" ]
}
}

My log file is like this

20-Jun-2018 11:08:22.137 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version: Apache Tomcat/8.5.31

What I want is I need to change the timestamp into another timezone and save it to Elasticsearch. Any help would be appreciable.

[Badger]

Try

    dissect {
        mapping => { "message" => "%{ts} %{+ts} %{restOfLine}" }
    }
    date { match => [ "ts", "dd-MMM-yyyy YY:mm:ss.SSS" ] timezone => "Europe/Moscow" }

Note that all dates in elasticsearch are stored as UTC.

[Melvin_Moses]

@Badger

dd-MMM-yyyy YY:mm:ss.SSS

What I want is not to change the timezone, but to change the time format like

dd-MMM-yyyy YY:mm:ss.SSS to yyy-MMM-dd YY:mm:ss.SSS

I have mapped my time index in Elasticsearch as like follows

PUT application_log
{"mappings": {
"doc": {
"properties": {

      "timestamp": {
        "type": "date",
        "format": "dd-MMM-yyyy HH:mm:ss.SSS"
          }
        }
      }
    }
  }
}

}
}

so I need to convert the date format from logstash