Hibernate flushToIndex failing after multiple entity index

in of service we are triggering :
fullTextEntityManager.index(person); and it’s dependency entity index as below
for (Case personCase : personCases) {
LOGGER.info(“Indexing case {}”, personCase.getId());
then in end we are

It was working till with Hibernate Search 5.3.0 Final, but after upgrading 5.8.0 Final it is failing with below error :
org.hibernate.HibernateException: Found shared references to a collection: com.core.db.entity.HistoryTask.translations

the particular translation table mapped as below :
@JoinColumn(name="key", referencedColumnName=“task_outcome”, insertable=false, updatable=false)
private Set translations;
So please help me out , how to prevent issue “Found shared references to a collection”