# Changing Unique Key of Elastic Search Index (Id column) **URL:** \ **Category:** Elasticsearch\ **Created:** [November 18, 2021, 11:06am UTC](https://discuss.elastic.co/t/changing-unique-key-of-elastic-search-index-id-column/289582 "2021-11-18T11:06:02Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![amey\_kulkarni](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amey_kulkarni/32/97268_2.png) [@amey\_kulkarni](https://discuss.elastic.co/u/amey_kulkarni)\ **Post date:** [November 18, 2021, 11:06am UTC](https://discuss.elastic.co/t/changing-unique-key-of-elastic-search-index-id-column/289582/1 "2021-11-18T11:06:02Z")
We have a requirement to set value of id column (unique key) of an index to values coming from data (values of couple of columns from data). Id column value is set for each document by default. We want to override it with combination of values of 2 incoming columns (data getting loaded in index). Could you please share if there are any options to achieve this? ---
**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:** [November 22, 2021, 12:12am UTC](https://discuss.elastic.co/t/changing-unique-key-of-elastic-search-index-id-column/289582/2 "2021-11-22T00:12:05Z")
Welcome to our community! 😃 When you send the document to Elasticsearch, you can define your own `_id` field like any other field. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 20, 2021, 12:12am UTC](https://discuss.elastic.co/t/changing-unique-key-of-elastic-search-index-id-column/289582/3 "2021-12-20T00:12:08Z")
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