# Mutate field with no format?

**URL:** <https://discuss.elastic.co/t/mutate-field-with-no-format/44928>\
**Category:** Logstash\
**Created:** [March 20, 2016, 10:17am UTC](https://discuss.elastic.co/t/mutate-field-with-no-format/44928 "2016-03-20T10:17:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Libfy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/libfy/32/6929_2.png) [@Libfy](https://discuss.elastic.co/u/Libfy)\
**Post date:** [March 20, 2016, 10:17am UTC](https://discuss.elastic.co/t/mutate-field-with-no-format/44928/1 "2016-03-20T10:17:02Z")

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Hi all,

I want to put in my logstash config file a mutate instruction to change a field in a number type without format pattern.

Could you please help me to do this?

Many thanks for your help.

Libfy

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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:** [March 20, 2016, 4:11pm UTC](https://discuss.elastic.co/t/mutate-field-with-no-format/44928/2 "2016-03-20T16:11:35Z")

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Sorry, I don't understand. Can you give an example that shows how you want to transform an event?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 5:06am UTC](https://discuss.elastic.co/t/mutate-field-with-no-format/44928/3 "2017-07-06T05:06:13Z")

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