How to debug Java Thread Park issues between client process and the Elastic Search server?

Elastic Stack Elasticsearch
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Question: How do I find out -

  1. What is causing the thread park on the client side
  2. Which Elastic search thread picked up this request and if it is parked there too?
    Use case: The client is calling the Elastic server for the searching for an object through rest API
    Issue: On the client side we see Java Thread Parked from 1 to 3 secs
    Stacktrace on the client side:
    sun.misc.Unsafe.park(boolean, long)
    java.util.concurrent.locks.LockSupport.parkNanos(Object, long) line: 226
    java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(int, long) line: 1033
    java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(int, long) line: 1326
    java.util.concurrent.CountDownLatch.await(long, TimeUnit) line: 282
    com.oracle.es.elasticsearch.client.RestClient$SyncResponseListener.get() line: 698
    com.oracle.es.elasticsearch.client.RestClient.performRequest(String, String, Map, HttpEntity, HttpAsyncResponseConsumerFactory, Header) line: 224
    com.oracle.es.elasticsearch.client.RestClient.performRequest(String, String, Map, HttpEntity, Header) line: 196
    ...
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