# Change 4000 fields in my index

**URL:** <https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504>\
**Category:** Elasticsearch\
**Created:** [April 21, 2023, 9:17am UTC](https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504 "2023-04-21T09:17:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![searchwithme](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/searchwithme/32/137075_2.png) [@searchwithme](https://discuss.elastic.co/u/searchwithme)\
**Post date:** [April 21, 2023, 9:17am UTC](https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504/1 "2023-04-21T09:17:21Z")

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I have nested json documents with about 4000 fields. To change the field type, I understand I have to reindex with a new index and updated mapping. But what if i want to change like 2500 fields? is there an alternative way to do this as opposed to manually creating a new mapping? updating 2500 fields seems tiring!

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [April 21, 2023, 9:37am UTC](https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504/2 "2023-04-21T09:37:57Z")

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You will need to craete a new index template with updated mapping. With that number of fields it may be worthwhile creating a script.

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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:** [April 25, 2023, 11:22pm UTC](https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504/3 "2023-04-25T23:22:03Z")

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To add to this, unfortunately there's nothing in the stack that can make this easy sorry to say.

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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:** [May 23, 2023, 11:22pm UTC](https://discuss.elastic.co/t/change-4000-fields-in-my-index/330504/4 "2023-05-23T23:22:21Z")

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