I have set up ILM policy on data stream and when I manually perform rollover trough rollover api, it's just a blink of an eye and new index is created.
BUT, if I use ILM, there is some step called check-rollover-ready and it takes very long time before actual rollover action. Is there some description of this check, or exists way to speed it up? It takes a very long time even if index has about 10 documents. I dont want to imagine what takes up at our bilions documents indices.