Is your use case really about deleting data 15 mins old, or are you just testing?
The reason I ask is ILM is not really design to operate on "Minute" Scheduled or Small KB/MB indices is designed to manage large scale indices GB, Hours, Days etc. and for that it works very well.
I posted a bit about it here and another elastician here
Thank you for your response. Yes, it was for testing before putting it in production. But I understand well and I will perform these tests with much larger intervals and more data.
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