@Override
  public @NotNull FileBasedIndex.InputFilter getInputFilter() {
    if (FileBasedIndexExtension.USE_VFS_FOR_FILENAME_INDEX) {
      return RejectAllIndexingHint.INSTANCE;
    }
    else {
      return AcceptAllFilesAndDirectoriesIndexingHint.INSTANCE;
    }
  }
@Override
  public @NotNull FileBasedIndex.InputFilter getInputFilter()