I’m really Sorry, I could not understand the below comments. could you please elaborate on these. So I could point you to the info you need.

By the way, the second thread dump has org.hibernate.search.backend.impl.lucene.SyncWorkProcessor in the stack trace, which indicates you are also running a Lucene backend *on top of* the Elasticsearch backend. This typically can only happen if you have two instances of Hibernate Search running, which should only happen if you have two instances of your application running with different configuration. Is that on purpose?

And BTW do you want to say that we are pointing the same Elastic Search instance from two different instances/or servers of our application?