Thread park Event seen in RestClient multiGet _msearch operation

We are seeing a ThreadPark of 249 ms in a 1 node elastic setup, Elastic server version is 6.5.4.
Thread park event is seen when on a sync multiGet operation .
I.e a POST request for multiGet(_msearch)

Thread park event captured from application,

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
org.elasticsearch.client.RestClient$SyncResponseListener.get() line: 929
org.elasticsearch.client.RestClient.performRequest(Request) line: 229

Is the thread park caused as the multiget takes more time to find the documents ? or is there a chance that there is a contention. what are the options to avoid threak park in this case.

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