Scroll cost (how to tune the `search.max_open_scroll_context` limit)

Elastic Stack Elasticsearch
1

Hi,

While preparing a migration to ES v7.5 I've seen that the limit of max_open_scroll_context defaults to 500. What metrics should I monitor before considering raising this limit? How can I monitor the "cost" of my scrolls?

Our current usage is between ~100 and 500 simultaneous scrolls. But our platform usage is growing fast and I would like to keep some margin.
I'm investigating whether raising to something like 2 to 5k is feasible or whether we should change some of our worklows when possible (for instance some of them would probably be fine with a search_after usage).

Thanks a lot.

Léonard

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