# Unique id for multiple indices having same alias

**URL:** https://discuss.elastic.co/t/unique-id-for-multiple-indices-having-same-alias/308854
**Category:** Elasticsearch
**Created:** [July 5, 2022, 4:39am UTC](https://discuss.elastic.co/t/unique-id-for-multiple-indices-having-same-alias/308854 "2022-07-05T04:39:54Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![suj0](https://avatars.discourse-cdn.com/v4/letter/s/dec6dc/32.png) [@suj0](https://discuss.elastic.co/u/suj0)
#### Post date: [July 5, 2022, 4:39am UTC](https://discuss.elastic.co/t/unique-id-for-multiple-indices-having-same-alias/308854/1 "2022-07-05T04:39:54Z")

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Is it possible to set unique id for multiple indices having same alias?  
for example I have 2 indices A001 and A002 under alias A .  
A001 have data with id as "1" and A002 dont have data with id "1" and my write index is A002.  
Now If I try to add data with id "1" in Index "A" it is creating a new entry in index A002.  
How can I make it update data with id "1" in Index A001 ?

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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: [July 5, 2022, 5:03am UTC](https://discuss.elastic.co/t/unique-id-for-multiple-indices-having-same-alias/308854/2 "2022-07-05T05:03:00Z")

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No, that is not possible. Elasticsearch can only enforce uniqueness per index.

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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: [August 2, 2022, 5:03am UTC](https://discuss.elastic.co/t/unique-id-for-multiple-indices-having-same-alias/308854/3 "2022-08-02T05:03:46Z")

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