# Mutate join filter

**URL:** <https://discuss.elastic.co/t/mutate-join-filter/186884>\
**Category:** Logstash\
**Created:** [June 21, 2019, 1:01pm UTC](https://discuss.elastic.co/t/mutate-join-filter/186884 "2019-06-21T13:01:43Z")\
**Posts on this page:** 1\
**Showing post:** 8

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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 24, 2019, 12:09pm UTC](https://discuss.elastic.co/t/mutate-join-filter/186884/8 "2019-06-24T12:09:24Z")

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Another possible approach is doc\_as\_upsert, as mentioned [here](https://discuss.elastic.co/t/aggregate-problem/142572/7).

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