Conditions for external refreshes

Elastic Stack Elasticsearch
1

Hey,

Elasticsearch has a metric for external refreshes in its RefreshStats, added in #38643, since 7.2.

I am wondering what can trigger such an external refresh, if all requests have refresh=false set.

Can a refresh be triggered and is called external if a lot of bulk requests are coming in, which in turn trigger an automatic refresh that is below the refresh interval threshold (5m in this case)?

This is on Elasticsearch 7.17.18.

Thanks for your help!

--Alex

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