How to convert date fields coming from MongoDB to an Elasticsearch date field?

[topgun743 (Faisal Chaudhary)]

I am using logstash-file-mongodb plugin for indexing data to Elasticsearch coming from MongoDB.

Here in my input file:

input {
	mongodb {
		uri => 'mongodb://myuser:mypwd@myhost/TestDB'
		placeholder_db_dir => 'E:/logstash-mongodb/'
		placeholder_db_name => 'logstash_sqlite.db'
		collection => 'MediaSummary'
		batch_size => 5000
		generateId => false
		parse_method => "simple"  
    }
}
filter {
	mutate {
                 rename => { "_id" => "mongo_id" }
	}
	date {
		match => ["StartDate", "YYYY-MM-dd HH:mm:ss.SSSZ"]
		target => "StartDate"
		timezone => "UTC"
	}
	date {
		match => ["EndDate", "YYYY-MM-dd HH:mm:ss.SSSZ"]
		target => "EndDate"
		timezone => "UTC"
	}
	date {
		match => ["ClientExpiryDate", "YYYY-MM-dd HH:mm:ss.SSSZ"]
		target => "ClientExpiryDate"
		timezone => "UTC"
	}
	mutate {
		remove_field => ["path","tags"]
	}
	
}
output {
	stdout {
		codec => rubydebug
	}
	elasticsearch {
		hosts => ["127.0.0.1:9200"]
		index => "mediasummary"
		doc_as_upsert => true
		document_id => "%{mongo_id}"
	}
}

My indexed data in Elasticsearch shows up somewhat like this:

"hits" : [
      {
        "_index" : "mediasummary",
        "_type" : "doc",
        "_id" : "59a41f63dba6488b332683ee",
        "_score" : 1.0,
        "_source" : {
          "@version" : "1",
          "StartDate" : "2017-03-13 11:48:53 UTC",
          "@timestamp" : "2019-01-23T14:28:16.877Z",
          "logdate" : "2017-08-28T13:49:23+00:00",
          "mongo_id" : "59a41f63dba6488b332683ee",
          "EndDate" : "2017-03-13 12:48:53 UTC"
         }
}]

You can see its not converting StartDate, EndDate fields correctly to Elasticsearch recognized date type. Only logdate and @timestamp fields showing in correct format.

So how I can convert date fields from input to Elasticsearch recognized date type.

[Badger]

"YYYY-MM-dd HH:mm:ss.SSSZ" does not match "2017-03-13 11:48:53 UTC". There are no milliseconds in that date string. Try

match => ["StartDate", "YYYY-MM-dd HH:mm:ss ZZZ"]