Hibernate-search worker execution async

src/main/resources/spring/spring-db.xml

@@ -55,6 +55,7 @@
 				<prop key="hibernate.hbm2ddl.auto">${db.hbm2ddl}</prop>
 				<prop key="hibernate.search.default.indexBase">${lucene.indexDir}</prop>
 				<prop key="hibernate.search.default.exclusive_index_use">false</prop>
+				<prop key="hibernate.search.default.​worker.execution">async</prop>
 			</props>
 		</property>
 		<property name="packagesToScan">