# Use map field as index name

**URL:** <https://discuss.elastic.co/t/use-map-field-as-index-name/207494>\
**Category:** Logstash\
**Created:** [November 12, 2019, 11:00am UTC](https://discuss.elastic.co/t/use-map-field-as-index-name/207494 "2019-11-12T11:00:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Anuwa\_A](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/anuwa_a/32/47533_2.png) [@Anuwa\_A](https://discuss.elastic.co/u/Anuwa_A)\
**Post date:** [November 12, 2019, 11:00am UTC](https://discuss.elastic.co/t/use-map-field-as-index-name/207494/1 "2019-11-12T11:00:48Z")

</div>

In my logstash config file

map['first\_name'] ||= event.get('first\_name') .

when i try to use that as my index  
index =\> "%{first\_name}"

index doesn't create.

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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 10, 2019, 11:00am UTC](https://discuss.elastic.co/t/use-map-field-as-index-name/207494/2 "2019-12-10T11:00:55Z")

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