Logstash grok filter

I have a log file which has a date time in 'yyyyMMdd_HHmmss_SSS' format. I am successful in parsing this with _ as delimiter and getting as 3 different text field in ES. But I need this to be converted as ISO_8601 so I can query and visualize the data by date or by hour or by minute.

Have you looked at the date filter?

Thanks for your reply, I did some reading about date filter and was able to get it parsed.

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