# Ilm policy errors for indices

**URL:** <https://discuss.elastic.co/t/ilm-policy-errors-for-indices/344694>\
**Category:** Elasticsearch\
**Tags:** ilm-index-lifecycle-management\
**Created:** [October 10, 2023, 2:40am UTC](https://discuss.elastic.co/t/ilm-policy-errors-for-indices/344694 "2023-10-10T02:40:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![shailendra1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/shailendra1/32/122783_2.png) [@shailendra1](https://discuss.elastic.co/u/shailendra1)\
**Post date:** [October 10, 2023, 2:40am UTC](https://discuss.elastic.co/t/ilm-policy-errors-for-indices/344694/1 "2023-10-10T02:40:58Z")

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Hi All,

duing the setup of my ILM policy for the indices , i am facing the errors

```auto
illegal_argument_exception: setting [index.lifecycle.rollover_alias] for index [csec_uat.test] is empty or not defined.

```

even after i have setup the aliases for indices but it is giving the errors for newly indices and also when i tried to map the policy to existing or older indices its giving the same errors .

- my elk is 8.5.3 version

my logstash does not have the rollover aliases defined so, as part of 8.5.x is it mandatory to define the aliases to work ILM properly ?

please can someone elaborate more

---

<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:** [November 7, 2023, 2:41am UTC](https://discuss.elastic.co/t/ilm-policy-errors-for-indices/344694/2 "2023-11-07T02:41:02Z")

</div>

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