docs: @Override
      public List<ProcessInstanceLog> findSubProcessInstances(long processInstanceId) {
          EntityManager em = getEntityManager();
          Query query = em
              .createQuery("FROM ProcessInstanceLog p WHERE p.parentProcessInstanceId = :processInstanceId")
                  .setParameter("processInstanceId", processInstanceId);
          return executeQuery(query, em, ProcessInstanceLog.class);
      }