# OpenSearch have a "lookup function"?

**URL:** <https://forum.opensearch.org/t/opensearch-have-a-lookup-function/12222>\
**Category:** OpenSearch\
**Tags:** index-management\
**Created:** [January 21, 2023, 1:03pm UTC](https://forum.opensearch.org/t/opensearch-have-a-lookup-function/12222 "2023-01-21T13:03:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nanashi.Tsugu](https://avatars.discourse-cdn.com/v4/letter/n/90ced4/32.png) [@Nanashi.Tsugu](https://forum.opensearch.org/u/Nanashi.Tsugu)\
**Post date:** [January 21, 2023, 1:03pm UTC](https://forum.opensearch.org/t/opensearch-have-a-lookup-function/12222/1 "2023-01-21T13:03:32Z")

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Does OpenSearch have a lookup function?

Does OpenSearch have a feature similar to “Splunk’s lookup” or “Elastic’s Lookup Rutieme Field”?

The reason is that I want to compare the index field and the list form field.

\*If the question is problematic in this community, please point it out. The survey didn’t go well, so I was at a loss and asked a question here. I’m sorry for troubling you.

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<div class="post-metadata">

**Author:** ![radu.gheorghe](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.opensearch.org/radu.gheorghe/32/3516_2.png) [@radu.gheorghe](https://forum.opensearch.org/u/radu.gheorghe)\
**Post date:** [January 23, 2023, 1:54pm UTC](https://forum.opensearch.org/t/opensearch-have-a-lookup-function/12222/2 "2023-01-23T13:54:55Z")

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Not directly, at least not until this will be implemented: [[RFC] Schema on Reads · Issue #1133 · opensearch-project/OpenSearch · GitHub](https://github.com/opensearch-project/OpenSearch/issues/1133)

That said, you can use script fields to emulate that kind of functionality.