# Error code 500

**URL:** <https://discuss.elastic.co/t/error-code-500/375739>\
**Category:** Elastic Security\
**Created:** [March 11, 2025, 8:22pm UTC](https://discuss.elastic.co/t/error-code-500/375739 "2025-03-11T20:22:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Esha](https://avatars.discourse-cdn.com/v4/letter/e/9de053/32.png) [@Esha](https://discuss.elastic.co/u/Esha)\
**Post date:** [March 11, 2025, 8:22pm UTC](https://discuss.elastic.co/t/error-code-500/375739/1 "2025-03-11T20:22:19Z")

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Received error message below when trying to import rule to Elastic security.

"Cannot use 'in' operator to search for 'investigation\_fields'

Has anyone encountered this before and anyone can advise on this?

Thank you

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [April 8, 2025, 8:22pm UTC](https://discuss.elastic.co/t/error-code-500/375739/2 "2025-04-08T20:22:50Z")

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