Rollover is when you create a new index, it doesn't delete the data.
There will be a section later in the policy that lets you configure when rolled indices are deleted.
Ok I see. But it's also possible to not use the rollover and just choose to delete entries older than 365 days?
For example, I keep my data for 10 days in the "warm" phase, and then I put them for 365 days in the "cold" zone before deleting them. So after 375 days my data will be deleted.
If you want to do this to need to roll your indices over.
ILM doesn't delete specific entries/events/documents in an index, it deletes the indices themselves.
I finally find the answers in another post : "Your data resides in your index, if you delete an index, the data is also deleted and space will be freed in the disk"
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