Hi, I have a questione about batch update and Hibernate Search. When I have many entities (for example big list of objects, List<something>) I should save each entity separately in loop ("Batch updates" in doc), or I could do something else which would be more efficient?

Hi,
if you can do all changes in a single transaction, that will be the most efficient operation: all operations will be queued in memory to be applied efficiently at commit time.
If the operations are too many though you might need to use org.hibernate.search.FullTextSession.flushToIndexes() to periodically flush this queue, or it might not fit in memory.