Bulk stuck in elatsicsearch

Cluster Info:-

1 Master 32 gb [16 gb for heap]

8 node 64 gb [32gb for heap]

20 shards 1 replica.

each machine has 16 core cpu. 1 Tb storage.

Trying to bulk indexing on elasticsearch but bulk always stuck at a point. when i hits cat thread pool api GET _cat/thread_pool?v. result shown 1 node has bulk in queue.I think this is problem.but i don't know how can i resolve it.

node name active queue rejected

node5 bulk 16 134 0

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