* This class contains only static constants and should not be instantiated.
     */
    private Constants() {
        // Utility class - no instantiation
    }

    // ============================================================
    // System and UI Constants
    // ============================================================

    /** System line separator character sequence. */

   *       is used to construct the sample instances. In case of tie, the candidate constructors or
   *       factories are tried one after another until one can be used to construct sample
   *       instances.
   *   <li>For the constructor or static factory method used to construct instances, it's checked
   *       that when equal parameters are passed, the result instance should also be equal; and vice
   *       versa.

            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        load();
    }

    /**
     * Returns a list of available KeyMatch instances.
     *
     * @return A list of KeyMatch instances.
     */
    public List<KeyMatch> getAvailableKeyMatchList() {
        return ComponentUtil.getComponent(KeyMatchBhv.class).selectList(cb -> {
            cb.query().matchAll();

    for (queue in TaskRunner.INSTANCE.activeQueues()) {
      // We wait at most 1 second, so we don't ever turn multiple lost threads into
      // a test timeout failure.
      val waitTime = (entryTime + 1_000_000_000L - System.nanoTime())
      if (!queue.idleLatch().await(waitTime, TimeUnit.NANOSECONDS)) {
        TaskRunner.INSTANCE.withLock {
          TaskRunner.INSTANCE.cancelAll()
        }

                    final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    factory.setFeature(Constants.FEATURE_SECURE_PROCESSING, true);
                    factory.setFeature(Constants.FEATURE_EXTERNAL_GENERAL_ENTITIES, false);
                    factory.setFeature(Constants.FEATURE_EXTERNAL_PARAMETER_ENTITIES, false);

     * @param client The OpenSearch client.
     * @param settings The SuggestSettings instance.
     * @param readingConverter The ReadingConverter instance.
     * @param contentsReadingConverter The contents ReadingConverter instance.
     * @param normalizer The Normalizer instance.
     * @param analyzer The SuggestAnalyzer instance.
     * @param threadPool The ExecutorService for thread pooling.

    ) = add(name, value.toHttpDateString())

    /**
     * Add a header with the specified name and formatted instant. Does validation of header names
     * and value.
     */
    @IgnoreJRERequirement // Only programs that already have Instant will use this.
    fun add(
      name: String,
      value: Instant,
    ) = add(name, Date.from(value))

    /**

 * used; or if the class exposes a public parameter-less constructor then it will be "new"d and
 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.

 * used; or if the class exposes a public parameter-less constructor then it will be "new"d and
 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.

      if (Serializable.class.isAssignableFrom(classToTest)) {
        try {
          Object instance = tester.instantiate(classToTest);
          if (instance != null) {
            if (isEqualsDefined(classToTest)) {
              SerializableTester.reserializeAndAssert(instance);
            } else {
              SerializableTester.reserialize(instance);
            }
          }
        } catch (Throwable e) {