docs: private Configuration getClientConf() {
      return HeronClientConfiguration.CONF
          .set(ClientConfiguration.ON_JOB_RUNNING, ReefClientSideHandlers.RunningJobHandler.class)
          .set(ClientConfiguration.ON_JOB_FAILED, ReefClientSideHandlers.FailedJobHandler.class)
          .set(ClientConfiguration.ON_RUNTIME_ERROR, ReefClientSideHandlers.RuntimeErrorHandler.class)
          .set(HeronClientConfiguration.TOPOLOGY_NAME, topologyName)
          .build();
    }