# Normalizer doesn't like trim filter
**URL:** https://discuss.elastic.co/t/normalizer-doesnt-like-trim-filter/106684
**Category:** Elasticsearch
**Created:** [November 7, 2017, 12:25pm UTC](https://discuss.elastic.co/t/normalizer-doesnt-like-trim-filter/106684 "2017-11-07T12:25:59Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@aslamy](https://discuss.elastic.co/u/aslamy)
#### Post date: [November 7, 2017, 12:25pm UTC](https://discuss.elastic.co/t/normalizer-doesnt-like-trim-filter/106684/1 "2017-11-07T12:25:59Z")
When I use trim filter in normalizer I get this exception:
"type" : "illegal\_argument\_exception",
"reason" : "Custom normalizer [my\_normalizer] may not use filter [trim]"
But it's fine to use lowercase filter instead.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 5, 2017, 12:26pm UTC](https://discuss.elastic.co/t/normalizer-doesnt-like-trim-filter/106684/2 "2017-12-05T12:26:55Z")
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