FullTextSession fullTextSession = Search.getFullTextSession(session);
Transaction tx = fullTextSession.beginTransaction();

// create native Lucene query unsing the query DSL
// alternatively you can write the Lucene query using the Lucene query parser
// or the Lucene programmatic API. The Hibernate Search DSL is recommended though
QueryBuilder qb = fullTextSession.getSearchFactory()
    .buildQueryBuilder().forEntity( Book.class ).get();
org.apache.lucene.search.Query query = qb
  .keyword()
  .onFields("title", "subtitle", "authors.name")
  .matching("Java rocks!");
  .createQuery();

// wrap Lucene query in a org.hibernate.Query
org.hibernate.Query hibQuery = 
    fullTextSession.createFullTextQuery(query, Book.class);

// execute search
List result = hibQuery.list();
  
tx.commit();
session.close();