# Elasticsearch output: Set user dynamically

**URL:** <https://discuss.elastic.co/t/elasticsearch-output-set-user-dynamically/131170>\
**Category:** Logstash\
**Created:** [May 9, 2018, 12:48pm UTC](https://discuss.elastic.co/t/elasticsearch-output-set-user-dynamically/131170 "2018-05-09T12:48:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![chp](https://avatars.discourse-cdn.com/v4/letter/c/ee59a6/32.png) [@chp](https://discuss.elastic.co/u/chp)\
**Post date:** [May 9, 2018, 12:48pm UTC](https://discuss.elastic.co/t/elasticsearch-output-set-user-dynamically/131170/1 "2018-05-09T12:48:15Z")

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Hi,

I would like to set the `user` of the elasticsearch output plugin dynamically based on the value of a field. Using the the syntax like `%{user}` doesn't work. Is there a way to achieve what I want?

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [May 9, 2018, 1:13pm UTC](https://discuss.elastic.co/t/elasticsearch-output-set-user-dynamically/131170/2 "2018-05-09T13:13:26Z")

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All events in a batch sent to an Elasticsearch output will be indexed as a single bulk request, so different events can not log in as different users. For that I believe you will need to use different output plugins. What is the rationale behind this requirement?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 6, 2018, 1:13pm UTC](https://discuss.elastic.co/t/elasticsearch-output-set-user-dynamically/131170/3 "2018-06-06T13:13:42Z")

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