# \[Bug\] Output/Kafka Can't use topics with uppercase letters anymore

**URL:** <https://discuss.elastic.co/t/bug-output-kafka-cant-use-topics-with-uppercase-letters-anymore/233194>\
**Category:** Beats\
**Created:** [May 18, 2020, 8:05pm UTC](https://discuss.elastic.co/t/bug-output-kafka-cant-use-topics-with-uppercase-letters-anymore/233194 "2020-05-18T20:05:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![theoo](https://avatars.discourse-cdn.com/v4/letter/t/bb73d2/32.png) [@theoo](https://discuss.elastic.co/u/theoo)\
**Post date:** [May 18, 2020, 8:05pm UTC](https://discuss.elastic.co/t/bug-output-kafka-cant-use-topics-with-uppercase-letters-anymore/233194/1 "2020-05-18T20:05:58Z")

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Hi there,

I wanted to upgrade my winlogbeat from 7.2.0 to 7.7.0 today but had to realize that the kafka output is broken.

In newer versions, the config option `topic` from `output.kafka` goes through a `constSelectorExpr` and is lowercased before being passed to the kafka client. This means that I can't write to a topic of mine anymore as it contains an uppercase letter.

I guess that's not an inteded behavior especially as I don't see a reference to it in the CHANGELOG. Can you shed some light on that issue for me? I would really like to upgrade the release ASAP as I hope it solves another issue of mine with wrong @timestamp from winlog/ActiveDirectory and non UTC time zones..

NOTE: GitHub pointed me to first post here before opening an issue over there...

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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 15, 2020, 10:05pm UTC](https://discuss.elastic.co/t/bug-output-kafka-cant-use-topics-with-uppercase-letters-anymore/233194/2 "2020-06-15T22:05:59Z")

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