# How to convert type for field like a.b in mutate plugin?

**URL:** https://discuss.elastic.co/t/how-to-convert-type-for-field-like-a-b-in-mutate-plugin/32236
**Category:** Logstash
**Created:** [October 15, 2015, 5:40am UTC](https://discuss.elastic.co/t/how-to-convert-type-for-field-like-a-b-in-mutate-plugin/32236 "2015-10-15T05:40:15Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [October 15, 2015, 6:27am UTC](https://discuss.elastic.co/t/how-to-convert-type-for-field-like-a-b-in-mutate-plugin/32236/6 "2015-10-15T06:27:12Z")

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> But I still wonder why add\_field a.b.c then convert a.b.c doesn't work?

Let's keep that discussion in the other thread:

> [@Convert String to float failed](https://discuss.elastic.co/t/convert-string-to-float-failed/32232/2):
>
> I also tried: convert =\> ["geoip.location", "float"] it doesn't works, either.

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