Org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution (shutting down) on org.elasticsearch.transport.TransportService

During indexing I got this exception :
org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution (shutting down) on org.elasticsearch.transport.TransportService.
Why it saying (shutting down), shutdown what ? The index cluster looks working fine, nothing is shutted down or this is something else ? In the servers elasticsearch logs everything looks ok and there not exceptions or errors.

Please advise.

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