@Service
public class HibernateSearchService {

private final EntityManager entityManager;

@Autowired
public HibernateSearchService(final EntityManagerFactory entityManagerFactory) {
    this.entityManager = entityManagerFactory.createEntityManager();
}

@PostConstruct
public void initialiseHibernateSearch() {
        System.out.println("About to initalise search");
    try {
        FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(entityManager);
        fullTextEntityManager.createIndexer().startAndWait();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
  }
}

hibernate.search.default.directory_provider = filesystem
hibernate.search.default.indexBase = /data/index/default

[ntifierloader-1] o.h.s.b.i.SimpleIndexingProgressMonitor  : HSEARCH000027: Going to reindex 4 entities
[  restartedMain] o.h.s.b.i.SimpleIndexingProgressMonitor  : HSEARCH000028: Reindexed 4 entities

@Transactional
public class HibernateSearchService {

EntityManager entityManager;

@PostConstruct
public void initialiseHibernateSearch() {
        System.out.println("About to initalise search");
    try {
        FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(entityManager);
        fullTextEntityManager.createIndexer().startAndWait();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
  }
}