assertTrue("Should find custom thread in dump", customThreadFound.get() > 0);

        } finally {
            latch.countDown();
            customThread.join(1000); // Wait up to 1 second for thread to finish
        }
    }

    public void test_writeThreadDump_fileContent() throws IOException {
        Path tempFile = Files.createTempFile("test-thread-dump-content", ".txt");

    }

    // Test with rapid config changes
    public void test_rapidConfigChanges() {
        for (int i = 0; i < 50; i++) {
            final int adjustment = i * 1000;
            FessConfig rapidConfig = new FessConfig.SimpleImpl() {
                private static final long serialVersionUID = 1L;

                @Override
                public String getTimeAdjustTimeMillis() {

            public int getNumberOfInFlightFetch() {
                return 0;
            }

            @Override
            public double getActiveShardsPercent() {
                return 100.0;
            }
        };
    }

    // Helper method to create test FessConfig
    private FessConfig createTestFessConfig() {
        return new TestFessConfig();
    }

/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" <jcifs at samba dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,

                                               value="${f:h(numOfThread)}" class="form-control"
                                               min="1" max="1000">
                                    </div>
                                </div>
                                <div class="form-group row">

/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" <jcifs at samba dot org>
 *                     "Paul Walker" <jcifs at samba dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *

            int nextValue = counter + 1;
            Thread.yield();
            counter = nextValue;
            return counter;
          }
        };

    int numThreads = 10;
    int iterations = 1000;
    Thread[] threads = new Thread[numThreads];
    for (int i = 0; i < numThreads; i++) {
      threads[i] =
          new Thread() {
            @Override
            public void run() {

        // Test should complete in under 1 second (much less than the original 25+ seconds)
        assertTrue("Test should complete quickly (duration: " + duration + "ms)", duration < 1000);
    }

    // Fast mock implementations to minimize overhead

    private static class FastMockIndexUpdateCallback implements IndexUpdateCallback {
        @Override
        public long getExecuteTime() {

  static {
    ImmutableSet.Builder<Double> integralBuilder = ImmutableSet.builder();
    ImmutableSet.Builder<Double> fractionalBuilder = ImmutableSet.builder();
    integralBuilder.addAll(Doubles.asList(0.0, -0.0, Double.MAX_VALUE, -Double.MAX_VALUE));
    // Add small multiples of MIN_VALUE and MIN_NORMAL
    for (int scale = 1; scale <= 4; scale++) {
      for (double d : Doubles.asList(Double.MIN_VALUE, Double.MIN_NORMAL)) {

/* jcifs smb client library in Java
 * Copyright (C) 2000  "Michael B. Allen" <jcifs at samba dot org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,