Message Title

Most likely due to an empty List<LuceneWork> being passed.
I could not spot where such an empty list would be passed by the upper stack.
Running my usual local test, I constantly see the following issues on my master node and my JMS queue's freeze during the persistence of an entity and pretty much always during reindexing.

15:06:14,724 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User) Exception in thread "Hibernate Search sync consumer thread for index com.acme.User" java.util.NoSuchElementException
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at java.util.ArrayList$Itr.next(ArrayList.java:834)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at org.hibernate.search.backend.impl.lucene.ChangesetList$WorkIterator.next(ChangesetList.java:85)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at org.hibernate.search.backend.impl.lucene.ChangesetList$WorkIterator.next(ChangesetList.java:61)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at org.hibernate.search.backend.impl.lucene.ChangesetList.copyToList(ChangesetList.java:98)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at org.hibernate.search.backend.impl.lucene.SyncWorkProcessor$Consumer.applyChangesets(SyncWorkProcessor.java:147)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at org.hibernate.search.backend.impl.lucene.SyncWorkProcessor$Consumer.run(SyncWorkProcessor.java:138)
15:06:14,725 ERROR [stderr] (Hibernate Search sync consumer thread for index com.acme.User)         at java.lang.Thread.run(Thread.java:744)