@Override
  public boolean processFilesContainingAllKeys(@NotNull Collection<? extends AllKeysQuery<?, ?>> queries,
                                               @NotNull GlobalSearchScope filter,
                                               @NotNull Processor<? super VirtualFile> processor) {
    Boolean scanResult = FileBasedIndexScanUtil.processFilesContainingAllKeys(queries, filter, processor);
    if (scanResult != null) return scanResult;
    return super.processFilesContainingAllKeys(queries, filter, processor);
  }
@Override
  public boolean processFilesContainingAllKeys(@NotNull Collection<? extends AllKeysQuery<?, ?>> queries,
                                               @NotNull GlobalSearchScope filter,
                                               @NotNull Processor<? super VirtualFile> processor)