case "crawler.hotthread.ignore_idle_threads":
                    return "true";
                case "crawler.hotthread.interval":
                    return "500ms";
                case "crawler.hotthread.snapshots":
                    return "10";
                case "crawler.hotthread.threads":
                    return "3";
                case "crawler.hotthread.timeout":

            assertTrue(scheduler.containsKey("running"));
            isRunning = (Boolean) scheduler.get("running");

            // Exponential backoff: gradually increase sleep time up to 500ms
            if (count % 10 == 0 && sleepTime < 500) {
                sleepTime = Math.min((long) (sleepTime * 1.3), 500);
            }
        }
        if (3000 <= count) {
            logger.info("Time out: Crawler takes too much time");

crawler.system.monitor.interval=60
# Whether to ignore idle threads in hot thread monitoring.
crawler.hotthread.ignore_idle_threads=true
# Interval for hot thread monitoring (e.g., 500ms).
crawler.hotthread.interval=500ms
# Number of snapshots for hot thread monitoring.
crawler.hotthread.snapshots=10
# Number of threads for hot thread monitoring.
crawler.hotthread.threads=3

- Fix apiserver request latency annotation in the audit log when request took more than 500ms ([#135685](https://github.com/kubernetes/kubernetes/pull/135685), [@chaochn47](https://github.com/chaochn47)) [SIG API Machinery]

     */
    boolean isCrawlerHotthreadIgnoreIdleThreads();

    /**
     * Get the value for the key 'crawler.hotthread.interval'. <br>
     * The value is, e.g. 500ms <br>
     * comment: Interval for hot thread monitoring (e.g., 500ms).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerHotthreadInterval();

    /**

        assertTrue("Expected at least 15ms sleep, got " + elapsed + "ms", elapsed >= 15);
        // Generous tolerance for CI environments like GitHub Actions
        assertTrue("Expected less than 200ms sleep, got " + elapsed + "ms", elapsed < 200);
    }

    @Test
    public void test_waitForNext_withZeroInterval() {
        configHelper.setReloadInterval(0L);

        long startTime = System.currentTimeMillis();

    runner.close();
    runner.clean();
}
```

### Testing Best Practices

- Minimize `Thread.sleep()` - use only when absolutely necessary
- For timestamp tests: use minimal delays (50-100ms)
- Clean only test-specific indices (not `_all` unless needed)
- Use `runner.refresh()` after index operations
- Test with realistic multilingual content

### Key Test Classes

        dataIndexHelper = new DataIndexHelper();
        setupMockComponents();
        // Reduce default interval to minimize test execution time
        dataIndexHelper.setCrawlingExecutionInterval(1L); // 1ms instead of 5000ms
    }

    private void setupMockComponents() {
        // Lightweight mock CrawlingConfigHelper
        ComponentUtil.register(new CrawlingConfigHelper() {
            @Override

        // Ensure alive starts as true
        assertTrue(dataStore.alive);

        final int readerThreadCount = 5;
        final long testDurationMs = 200; // Run for 200ms
        final Thread[] readerThreads = new Thread[readerThreadCount];
        final java.util.List<Boolean>[] observations = new java.util.List[readerThreadCount];
        final CountDownLatch startLatch = new CountDownLatch(1);

        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.register(new SlowSearcher(100)); // 100ms delay
            processor.init();

            // Should complete even with slow searcher
            final long startTime = System.currentTimeMillis();