ILM based on disk space / FIFO indices

Im wondering if there is option to save Elastic from getting above 90% disk space..
I have ILM policy set to rollover new index every 50 GIGA and Delete phase for 30 Days. i have 10 Tera disk space on my Cluster...
My data amount is different from day to day and sometimes i need to delete indices manually because Elastic doesn't have enough disk space.
Is there any idea for manage that ?
Retention policy maybe?

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