public <K> boolean processAllKeys(@NotNull StubIndexKey<K, ?> indexKey,
                                    @NotNull Processor<? super K> processor,
                                    @NotNull GlobalSearchScope scope) {
    return processAllKeys(indexKey, processor, scope, null);
  }
public <K> boolean processAllKeys(@NotNull StubIndexKey<K, ?> indexKey,
                                    @NotNull Processor<? super K> processor,
                                    @NotNull GlobalSearchScope scope)