The first milestone to support Apache Lucene 4 is now available: http://in.relation.to/Bloggers/HibernateSearchMigratingToApacheLucene46 Even though this is an Alpha release I encourage all users to start a branch to try this out and have an own milestone, as we managed so far to avoid breaking most *our* API. Lucene's APIs changed very significantly, so this milestone is intended to facilitate migrations. -- Sanne