How to diagnose rejected execution exception?

How to diagnose es_rejected_execution_exception?

I see a number of threads about running out of threads (ha ha) but I didn't find one that answers the following question:

I don't think there's that much going on on the system, so if there are 1,000 requests queued and more requests coming in that sounds wrong to me. How do I find out what these requests are, so I can identify and fix whatever is causing them? I have X-pack monitoring if that's any help, but I don't know what to look for.

Please? - there must be somebody who knows something about Elasticsearch performance?

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