# Enrich index with data found in another index **URL:** \ **Category:** Elasticsearch\ **Tags:** painless\ **Created:** [June 27, 2023, 9:53am UTC](https://discuss.elastic.co/t/enrich-index-with-data-found-in-another-index/336966 "2023-06-27T09:53:31Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![stobbe](https://avatars.discourse-cdn.com/v4/letter/s/b2d939/32.png) [@stobbe](https://discuss.elastic.co/u/stobbe)\ **Post date:** [June 27, 2023, 9:53am UTC](https://discuss.elastic.co/t/enrich-index-with-data-found-in-another-index/336966/1 "2023-06-27T09:53:31Z")
Hello, What is the best way to add a field to an existing indexm where the value is filled with data from an other index. E.g. most commont example you have an index with a name field amd you want to add an email address. This email address can be found in an other index. Is reindex with a painless script an option, a script that updates or is an enrich pipeline the best option? KR Henk ---
**Author:** ![Alec\_Carpenter2](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alec_carpenter2/32/117725_2.png) [@Alec\_Carpenter2](https://discuss.elastic.co/u/Alec_Carpenter2)\ **Post date:** [June 27, 2023, 2:50pm UTC](https://discuss.elastic.co/t/enrich-index-with-data-found-in-another-index/336966/2 "2023-06-27T14:50:29Z")
An enrich processor is your best bet for adding an email address from another index to the existing index. An example for this specific scenario is found in the docs [here](https://www.elastic.co/guide/en/elasticsearch/reference/current/match-enrich-policy-type.html). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 25, 2023, 2:51pm UTC](https://discuss.elastic.co/t/enrich-index-with-data-found-in-another-index/336966/3 "2023-07-25T14:51:18Z")
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