# Quick question about ILM

**URL:** <https://discuss.elastic.co/t/quick-question-about-ilm/324574>\
**Category:** Elasticsearch\
**Tags:** ilm-index-lifecycle-management\
**Created:** [February 2, 2023, 7:24pm UTC](https://discuss.elastic.co/t/quick-question-about-ilm/324574 "2023-02-02T19:24:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Monica\_majua](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/monica_majua/32/116099_2.png) [@Monica\_majua](https://discuss.elastic.co/u/Monica_majua)\
**Post date:** [February 2, 2023, 7:24pm UTC](https://discuss.elastic.co/t/quick-question-about-ilm/324574/1 "2023-02-02T19:24:40Z")

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I would like to ask what is an ILM? and is it related to Legacy templates? Is possible to assign an ILM to a Legacy template?

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**Author:** ![Venkata\_Raja](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/venkata_raja/32/114264_2.png) [@Venkata\_Raja](https://discuss.elastic.co/u/Venkata_Raja)\
**Post date:** [February 3, 2023, 11:34am UTC](https://discuss.elastic.co/t/quick-question-about-ilm/324574/2 "2023-02-03T11:34:59Z")

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Hi Monica,

ILM is used to automate phase transition(hot-warm-cold-frozen-delete) automatically.  
if you add it i templates , that policy will be automatically added to all future indices.

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**Author:** ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb)\
**Post date:** [February 3, 2023, 3:53pm UTC](https://discuss.elastic.co/t/quick-question-about-ilm/324574/3 "2023-02-03T15:53:53Z")

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Hi @Monica_majua

And to add to what @Venkata_Raja said so well, the ILM policy can be set in either the new or legacy templates.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 3, 2023, 3:54pm UTC](https://discuss.elastic.co/t/quick-question-about-ilm/324574/4 "2023-03-03T15:54:22Z")

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