Finally, we enable the SearchEventListener for the three Hibernate events that occur after changes are executed to the database.

<hibernate-configuration>
    ...
    <event type="post-update" 
        <listener class="org.hibernate.search.event.FullTextIndexEventListener"/>
    </event>
    <event type="post-insert" 
        <listener class="org.hibernate.search.event.FullTextIndexEventListener"/>
    </event>
    <event type="post-delete" 
        <listener class="org.hibernate.search.event.FullTextIndexEventListener"/>
    </event>
</hibernate-configuration>