# Update mapping format

**URL:** <https://discuss.elastic.co/t/update-mapping-format/162208>\
**Category:** Elasticsearch\
**Created:** [December 27, 2018, 6:58am UTC](https://discuss.elastic.co/t/update-mapping-format/162208 "2018-12-27T06:58:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ashnik](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@ashnik](https://discuss.elastic.co/u/ashnik)\
**Post date:** [December 27, 2018, 6:58am UTC](https://discuss.elastic.co/t/update-mapping-format/162208/1 "2018-12-27T06:58:21Z")

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Hi,

I am using elasticsearch 6.4.  
The date type format recently changed from "epoch\_millis" to "dd MMMM, yyyy (HH:mm:ss)".  
Currently there is no data in elasticsearch for this field.

Is it possible to update the format by any chance..?  
This will save loads of work if possible if the format can be updated..

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [December 27, 2018, 7:22am UTC](https://discuss.elastic.co/t/update-mapping-format/162208/2 "2018-12-27T07:22:38Z")

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You can dynamically update the mapping on a field that has no data in it.

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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:** [January 24, 2019, 7:22am UTC](https://discuss.elastic.co/t/update-mapping-format/162208/3 "2019-01-24T07:22:44Z")

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