how to Process Initiation Authorization in flowable 6.3.1

I watch the document. https://www.activiti.org/userguide/index.html 8.8. Process Initiation Authorization

List authorizedGroups = identityService().createGroupQuery().potentialStarter("processDefinitionId").list();

but since activiti 6, it's not exist any more, how to process initiation authorization in flowable?