Hibernate Search will transparently index every entity persisted, updated or removed through Hibernate Core. However, you have to trigger an initial indexing to populate the Lucene index with the data already present in your database. Once you have added the above properties and annotations it is time to trigger an initial batch index of your books. You can achieve this by using one of the following code snippets (see also Chapter 6, Manual indexing):

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

List books = session.createQuery("from Book as book").list();
for (Book book : books) {
    fullTextSession.index(book);
}

tx.commit(); //index is written at commit time       
    

EntityManager em = entityManagerFactory.createEntityManager();
FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(em);
em.getTransaction().begin();

List books = em.createQuery("select book from Book as book").getResultList();
for (Book book : books) {
    fullTextEntityManager.index(book);
} 

em.getTransaction().commit();
em.close();


    

After executing the above code, you should be able to see a Lucene index under /var/lucene/indexes/example.Book. Go ahead an inspect this index with Luke. It will help you to understand how Hibernate Search works.