* <p>This method is just a small convenience, either for {@code newHashSet(}{@link Arrays#asList
   * asList}{@code (...))}, or for creating an empty set then calling {@link Collections#addAll}.
   * This method is not actually very useful and will likely be deprecated in the future.
   */
  @SuppressWarnings("NonApiType") // acts as a direct substitute for a constructor call
  public static <E extends @Nullable Object> HashSet<E> newHashSet(E... elements) {

The steps below show how to use this notification target in `namespace` format. The other format is very similar and is omitted for brevity.

### Step 1: Ensure Elasticsearch minimum requirements are met

	filePath := pathJoin(volumeDir, partPath)
	st, err := Lstat(filePath)
	if err != nil {
		if osIsNotExist(err) {
			if !skipAccessCheck {
				// Stat a volume entry.
				if verr := Access(volumeDir); verr != nil {
					if osIsNotExist(verr) {
						resp = checkPartVolumeNotFound
					}
					return resp
				}
			}
		}
		if osErrToFileErr(err) == errFileNotFound {
			resp = checkPartFileNotFound

		// Setting maxKeys to negative value (15-16).
		{"empty-bucket", "", "", "", -1, ListObjectsInfo{}, nil, true},
		{"empty-bucket", "", "", "", 1, ListObjectsInfo{}, nil, true},
		// Setting maxKeys to a very large value (17).
		{"empty-bucket", "", "", "", 111100000, ListObjectsInfo{}, nil, true},
		// Testing for all 10 objects in the bucket (18).
		{"test-bucket-list-object", "", "", "", 10, resultCases[0], nil, true},

   *
   * <p>When eviction is necessary, the cache evicts entries that are less likely to be used again.
   * For example, the cache may evict an entry because it hasn't been used recently or very often.
   *
   * <p>If {@code maximumSize} is zero, elements will be evicted immediately after being loaded into
   * cache. This can be useful in testing, or to disable caching temporarily.
   *

  // final fields.
  //
  // For simplicity the rest of this description will discuss Futures.catching since it is the
  // simplest instance, though very similar descriptions apply to many other classes in this file.
  //
  // In the constructor of AbstractCatchingFuture, the delegate future is assigned to a field