# Special characters in field names? (äöü, ...)

**URL:** <https://discuss.elastic.co/t/special-characters-in-field-names-aou/158004>\
**Category:** Logstash\
**Created:** [November 23, 2018, 12:17pm UTC](https://discuss.elastic.co/t/special-characters-in-field-names-aou/158004 "2018-11-23T12:17:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![asp](https://avatars.discourse-cdn.com/v4/letter/a/9fc348/32.png) [@asp](https://discuss.elastic.co/u/asp)\
**Post date:** [November 23, 2018, 12:17pm UTC](https://discuss.elastic.co/t/special-characters-in-field-names-aou/158004/1 "2018-11-23T12:17:53Z")

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Hi,

is it possible to use special characters like German chars **äöüÄÜÜß** in field names?  
Logstash 6.5.1 is throwing:

```
detected ambiguous Field Reference `[Blob][Datei][L`, which we expanded to the path `[Blob, Datei, L]`; in a future release of Logstash, ambiguous Field References will not be expanded.

```

The targeted field name was [Blob][Datei][Länge]

Just curious if there is an option to use these chars, or if I need to avoid them.

Thanks, Andreas

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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:** [December 21, 2018, 12:17pm UTC](https://discuss.elastic.co/t/special-characters-in-field-names-aou/158004/2 "2018-12-21T12:17:56Z")

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