Why my query got rejected

Hi Elasticsearch

I am using Datadog to monitor my ES cluster. Sometimes I see there is some rejected query. I also checked the threadpool.queue size and it never reach the default threshold 1000.
"rejected The number of tasks rejected by the thread pool executor"

Can I know when the query will be rejected by ES? What other metric I can check in ES regarding this issue?

The next three columns show the active queue and rejected statistics for the bulk search pool.

search.active search.queue search.rejected
0 0 0

When the search.rejected will be non-zero?

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