CoreSession leak due to long time stored references in content template

  <extension target="org.nuxeo.ecm.platform.content.template.service.ContentTemplateService" point="factory">
    <contentFactory name="ConnectProjectTemplateFactory" class="com.nuxeo.connect.template.ConnectProjectTemplateBasedFactory" />
    <contentFactory name="ConnectServiceTemplateFactory" class="com.nuxeo.connect.template.ConnectServiceTemplateBasedFactory" />
  </extension>

public abstract class BaseContentFactory implements ContentFactory {

    protected CoreSession session;

    protected boolean initSession(DocumentModel eventDoc) {
        session = eventDoc.getCoreSession();
        return session != null;
    }

}