Roll over Rollup index

In order to keep data for a long time, I need to perform a rollover (ilm) on a rollup index.
The idea is that the rollup index does not grow forever.
I'am a bit confused rollover works with aliases that allows to handle versions of index we want to keep.
On the other hand rollup does not seem aware of aliases and fills a specific index.
Please any idea how to handle that ?

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