@Override
  public @NotNull FileBasedIndex.InputFilter getInputFilter() {
    return new DefaultFileTypeSpecificInputFilter(HtmlFileType.INSTANCE, XHtmlFileType.INSTANCE) {
      @Override
      public boolean acceptInput(final @NotNull VirtualFile file) {
        return file.isInLocalFileSystem();
      }
    };
  }
@Override
  public @NotNull FileBasedIndex.InputFilter getInputFilter()