Cant parse date from log

Hi, im trying to parse timestamp from from log to field so I can choose it when creating new index. Date format from log is: 2020-05-19 11:03:18.954 In logstash I defined:

       match => [ "timestamp", "YYYY-MM-dd HH:mm:ss.SSS"]
       target => "timestamp"

grok pattern: %{TIMESTAMP_ISO8601:timestamp} .........
But still in index creation page I can only see @timestamp to choose. Can somebody help?

What type does the [timestamp] field have if you check it in the index management pages in kibana?

@Badger It has String type.

Ok now its working, It looks like only restarting logstash and then click on refresh button on page where you choose timestamp is not enough, I had to restart filebeat too and now I can choose timestamp from log.

Once a field in an index is a string, it will stay a string. Even if you feed elasticsearch a Logstash::Timestamp, it will convert it to a string if the field already exists. If you roll over to a new index it will start being indexed as a timestamp.

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