Elasticsearch gives execption while report download["message":"Request cannot be executed; I/O reactor status: STOPPED","errorstacktrace":"java.lang.RuntimeException]

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Have a look at: Low-level REST client status error:ava.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED · Issue #42133 · elastic/elasticsearch (github.com)
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Elasticsearch Request cannot be executed; I/O reactor status: STOPPED - Stack Overflow
It's worth checking on how many connections are being created from your client to ES, creating too many connections or not closing them properly can lead to this situation.