public void process(@Nonnull final SyncLocalOccupantsAndSendJoinPresenceTask task) {
        occupantManager.process(task);
        makeOccupantsOnConnectedClusterNodeJoin(task.getOccupants(), task.getOriginator());
    }
Used by other nodes telling us about their occupants.
@param task
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/MultiUserChatServiceImpl.java