# When use variables in output.kakfa ,it doesn't work

**URL:** <https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086>\
**Category:** Beats\
**Tags:** filebeat\
**Created:** [May 18, 2020, 10:53am UTC](https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086 "2020-05-18T10:53:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![XFLaura](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/xflaura/32/68061_2.png) [@XFLaura](https://discuss.elastic.co/u/XFLaura)\
**Post date:** [May 18, 2020, 10:53am UTC](https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086/1 "2020-05-18T10:53:08Z")

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my filebeat version is 7.6.2  
and I config the input.fields.log\_topic ,  
but when I use the same variable in output.kafka as a topic ,it doesn't work

output.kafka:  
enabled: true  
hosts: ["192.168.2.21:9092","192.168.2.22:9092","192.168.2.27:9092"] # kafka  
topic: '%{[fields][log\_topics]}'

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<div class="post-metadata">

**Author:** ![mtojek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mtojek/32/63863_2.png) [@mtojek](https://discuss.elastic.co/u/mtojek)\
**Post date:** [May 18, 2020, 1:52pm UTC](https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086/2 "2020-05-18T13:52:02Z")

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Could you please share the entire config and use the "code" tags?

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<div class="post-metadata">

**Author:** ![XFLaura](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/xflaura/32/68061_2.png) [@XFLaura](https://discuss.elastic.co/u/XFLaura)\
**Post date:** [May 19, 2020, 2:12am UTC](https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086/3 "2020-05-19T02:12:06Z")

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I solve the problem as [https://github.com/elastic/beats/issues/11988](https://github.com/elastic/beats/issues/11988)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [June 16, 2020, 2:12am UTC](https://discuss.elastic.co/t/when-use-variables-in-output-kakfa-it-doesnt-work/233086/4 "2020-06-16T02:12:17Z")

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