fetchChildren example

        }

        if ($idsWithChangedParentIds !== []) {
            $this->treeUpdater->batchUpdate(
                $idsWithChangedParentIds,
                MediaFolderDefinition::ENTITY_NAME,
                $event->getContext()
            );
        }

        $updates = array_values(array_merge($updates, $this->fetchChildren($updates), $this->getParentIds($updates)));

        return new MediaIndexingMessage($updates, null, $event->getContext());
    }

    public function handle(EntityIndexingMessage $message): void
    {
        $context = $message->getContext();

        $ids = $message->getData();
        $ids = array_filter(array_unique($ids));

        

return null;
        }

        if ($idsWithChangedParentIds !== []) {
            $this->treeUpdater->batchUpdate(
                $idsWithChangedParentIds,
                CategoryDefinition::ENTITY_NAME,
                $event->getContext()
            );
        }

        $children = $this->fetchChildren($ids, $event->getContext()->getVersionId());

        $ids = array_unique(array_merge($ids, $children));

        return new CategoryIndexingMessage(array_values($ids), null, $event->getContext(), \count($ids) > 20);
    }

    public function handle(EntityIndexingMessage $message): void
    {
        $ids = $message->getData();

        /** @var list<string> $ids */