@Nullable
  public String getStorageClass() {
    return _storageClass;
  }
@Test
  public void testIntelligentTieringStorageClass() {
    PinotConfiguration pinotConfig = new PinotConfiguration();
    pinotConfig.setProperty("storageClass", StorageClass.INTELLIGENT_TIERING.toString());
    S3Config cfg = new S3Config(pinotConfig);
    Assert.assertEquals(cfg.getStorageClass(), "INTELLIGENT_TIERING");
  }