ESSourceReader reader = new ESSourceReader(client, settings, indexName);
        reader.setScrollSize(1000);
        int count = 0;
        Set<String> valueSet = Collections.synchronizedSet(new HashSet<>());
        Map<String, Object> source;
        while ((source = reader.read()) != null) {
            assertTrue(source.get("field1").toString().startsWith("test"));

  }

  public void testKeySet() {
    Map<String, Integer> map = create();
    Set<String> keySet = map.keySet();
    assertTrue(keySet instanceof SynchronizedSet);
    assertSame(mutex, ((SynchronizedSet<?>) keySet).mutex);
  }

  public void testValues() {
    Map<String, Integer> map = create();
    Collection<Integer> values = map.values();

 *
 * @since 3.0
 */
public class ReactorBuildStatus {
    private final ProjectDependencyGraph projectDependencyGraph;

    private final Collection<String> blackListedProjects = Collections.synchronizedSet(new HashSet<>());

    private volatile boolean halted = false;

    public ReactorBuildStatus(ProjectDependencyGraph projectDependencyGraph) {
        this.projectDependencyGraph = projectDependencyGraph;
    }

/**
 * Fetches HTML from a requested URL, follows the links, and repeats.
 */
public final class Crawler {
  private final OkHttpClient client;
  private final Set<HttpUrl> fetchedUrls = Collections.synchronizedSet(new LinkedHashSet<>());
  private final BlockingQueue<HttpUrl> queue;
  private final ConcurrentHashMap<String, AtomicInteger> hostnames = new ConcurrentHashMap<>();
  private final int hostLimit;

  @VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override
    Set<E> delegate() {

  @VisibleForTesting
  static <E extends @Nullable Object> Set<E> set(Set<E> set, @Nullable Object mutex) {
    return new SynchronizedSet<>(set, mutex);
  }

  static class SynchronizedSet<E extends @Nullable Object> extends SynchronizedCollection<E>
      implements Set<E> {

    SynchronizedSet(Set<E> delegate, @Nullable Object mutex) {
      super(delegate, mutex);
    }

    @Override
    Set<E> delegate() {

              numSuccessfulSetCalls.incrementAndGet();
            }
            awaitUnchecked(barrier);
            return null;
          }
        };
    Set<Object> finalResults = Collections.synchronizedSet(Sets.newIdentityHashSet());
    Runnable collectResultsRunnable =
        new Runnable() {
          @Override
          public void run() {
            try {

              numSuccessfulSetCalls.incrementAndGet();
            }
            awaitUnchecked(barrier);
            return null;
          }
        };
    Set<Object> finalResults = Collections.synchronizedSet(Sets.newIdentityHashSet());
    Runnable collectResultsRunnable =
        new Runnable() {
          @Override
          public void run() {
            try {

    private Map<String, Object> context;

    private ClassRealm classRealm;

    private DependencyFilter extensionDependencyFilter;

    private final Set<String> lifecyclePhases = Collections.synchronizedSet(new LinkedHashSet<>());

    public MavenProject() {
        Model model = new Model();

        model.setGroupId(EMPTY_PROJECT_GROUP_ID);
        model.setArtifactId(EMPTY_PROJECT_ARTIFACT_ID);