* Combines scheduler.target.name (if configured), hostname, and PID
     * to ensure uniqueness across multiple JVMs on the same host.
     *
     * @return The instance ID.
     */
    public String getInstanceId() {
        final String targetName = ComponentUtil.getFessConfig().getSchedulerTargetName();
        final String hostname = getHostname();
        final long pid = ProcessHandle.current().pid();

    }

    /**
     * Initializes the coordinator by sending an initial heartbeat and starting the poll loop.
     */
    @PostConstruct
    public void init() {
        instanceId = ComponentUtil.getSystemHelper().getInstanceId();
        lastEventCheckTime = System.currentTimeMillis();

        sendHeartbeat();

        final FessConfig fessConfig = ComponentUtil.getFessConfig();

            }
        });
        final String hostname = systemHelper.getHostname();
        final long pid = ProcessHandle.current().pid();
        assertEquals(hostname + ":" + pid, systemHelper.getInstanceId());
    }

    @Test
    public void test_getInstanceId_withTargetName() {
        // When scheduler.target.name is set, instanceId is targetName@hostname:pid