The bulk thread pool has a cap on the queue size which is 50 (threadpool.bulk.queue_size). Once you reach that cap, you will start getting the rejected exceptions. That is there for a reason so that the thread pool does not get out of control. You can try to increase the queue size slightly but if that still doesn't fix your problem, then you need to reduce your bulk concurrency/size since you may be reaching the limits of what your node hardware can handle.
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