final long start2 = System.nanoTime();
        controller.delayBeforeProcessing();
        final long elapsed2 = (System.nanoTime() - start2) / 1000000;
        assertTrue("Second access should delay at least 100ms", elapsed2 >= 90);
    }

    /**
     * Test that cache is thread-safe with concurrent access
     */
    public void test_cacheThreadSafety() {
        final int numTasks = 50;

        assertEquals(2, response2.getNum());

        // Sleep only until next second to ensure unique index name (typically <100ms)
        long currentMillis = System.currentTimeMillis();
        long millisUntilNextSecond = 1000 - (currentMillis % 1000);
        Thread.sleep(millisUntilNextSecond + 10); // +10ms buffer
        suggester.createNextIndex();
        SuggestItem[] items2 = getItemSet2();

        suggester.refresh();

        long oldWordsCount = suggester.getAllWordsNum();
        assertTrue(oldWordsCount > 0);

        // Minimal sleep to ensure timestamp separation (reduced from 2000ms to 100ms total)
        Thread.sleep(50);
        ZonedDateTime threshold = ZonedDateTime.now();
        Thread.sleep(50);

        // Index new data after threshold
        document = new HashMap<>();

    private final Queue<WitnessNotification> pendingNotifications;
    private final ScheduledExecutorService scheduler;
    private final int batchSize = 10;
    private final long batchTimeout = 100;  // 100ms
    
    public void addNotification(WitnessNotification notification) {
        synchronized (pendingNotifications) {
            pendingNotifications.offer(notification);
            

        // Test various timeout format strings
        builder.scrollTimeout("1000ms")
                .searchTimeout("1m")
                .indexTimeout("1h")
                .bulkTimeout("1d")
                .indicesTimeout("500")
                .clusterTimeout("10000ms");

        assertEquals("1000ms", builder.timeoutSettings.scrollTimeout);
        assertEquals("1m", builder.timeoutSettings.searchTimeout);

        }

        // Check total memory allocation
        long totalSize = (long) size * (long) elementSize;
        long maxAllocation = 100 * 1024 * 1024; // 100MB max

        if (totalSize > maxAllocation) {
            failedValidations.incrementAndGet();
            log.warn("Array allocation too large: {} bytes", totalSize);

                auth1.equals(auth3);
                auth2.equals(auth3);
            }
            long totalTime = System.nanoTime() - startTime;

            // Should complete in reasonable time (< 10ms for 3000 operations)
            assertTrue(totalTime < 10_000_000L, "Null/empty password comparisons taking too long: " + totalTime + " ns");
        } finally {
            auth1.close();
            auth2.close();

    private static final long BASE_RETRY_DELAY = 1000;
    private static final long MAX_RETRY_DELAY = 30000;
    private static final int MAX_BACKOFF_SHIFT = 3; // Maximum 8 seconds (2^3 * 1000ms)

    private final DirectoryLeaseManager leaseManager;
    private final ConcurrentHashMap<String, ChangeNotificationHandle> activeWatchers;
    private final ConcurrentHashMap<String, Integer> failureCounts;

    /**