# Logstash/grok to match only first occurrence and stop parsing repeatedly for same values

**URL:** <https://discuss.elastic.co/t/logstash-grok-to-match-only-first-occurrence-and-stop-parsing-repeatedly-for-same-values/274201>\
**Category:** Logstash\
**Created:** [May 27, 2021, 11:41am UTC](https://discuss.elastic.co/t/logstash-grok-to-match-only-first-occurrence-and-stop-parsing-repeatedly-for-same-values/274201 "2021-05-27T11:41:22Z")\
**Posts on this page:** 1\
**Showing post:** 23

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [June 4, 2021, 3:55pm UTC](https://discuss.elastic.co/t/logstash-grok-to-match-only-first-occurrence-and-stop-parsing-repeatedly-for-same-values/274201/23 "2021-06-04T15:55:25Z")

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[Upgrade](https://discuss.elastic.co/t/new-way-in-which-java-execution-breaks-the-aggregate-filter/239377) at least to 7.9.1, or disable the java execution engine.

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_[View the full topic](https://discuss.elastic.co/t/logstash-grok-to-match-only-first-occurrence-and-stop-parsing-repeatedly-for-same-values/274201)._