public <Key, Psi extends PsiElement> boolean processElements(@NotNull StubIndexKey<Key, Psi> indexKey,
                                                               @NotNull Key key,
                                                               @NotNull Project project,
                                                               @Nullable GlobalSearchScope scope,
                                                               @Nullable IdFilter idFilter,
                                                               @NotNull Class<Psi> requiredClass,
                                                               @NotNull Processor<? super Psi> processor) {
    return processElements(indexKey, key, project, scope, requiredClass, processor);
  }
public <Key, Psi extends PsiElement> boolean processElements(@NotNull StubIndexKey<Key, Psi> indexKey,
                                                               @NotNull Key key,
                                                               @NotNull Project project,
                                                               @Nullable GlobalSearchScope scope,
                                                               @Nullable IdFilter idFilter,
                                                               @NotNull Class<Psi> requiredClass,
                                                               @NotNull Processor<? super Psi> processor)