# Field name cannot contain '.'

**URL:** <https://discuss.elastic.co/t/field-name-cannot-contain/33251>\
**Category:** Logstash\
**Created:** [October 29, 2015, 2:05pm UTC](https://discuss.elastic.co/t/field-name-cannot-contain/33251 "2015-10-29T14:05:04Z")\
**Posts on this page:** 1\
**Showing post:** 29

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**Author:** ![theuntergeek](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/theuntergeek/32/44961_2.png) [@theuntergeek](https://discuss.elastic.co/u/theuntergeek)\
**Post date:** [January 27, 2016, 2:48pm UTC](https://discuss.elastic.co/t/field-name-cannot-contain/33251/29 "2016-01-27T14:48:08Z")

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@bblank you're correct. I wasn't looking too close when I wrote that.

This is a really tricky situation as that's likely to be an undesirable field name anyway. If you know what it is, you can do a `remove_field` _after_ copying the contents to a new field. If you don't know what the field name is, that makes things much harder.

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