indexIfNeeded example

    public static function getSubscribedEvents(): array
    {
        return [
            RuleEvents::RULE_LOADED_EVENT => 'unserialize',
        ];
    }

    public function unserialize(EntityLoadedEvent $event): void
    {
        $this->indexIfNeeded($event);

        /** @var RuleEntity $entity */
        foreach ($event->getEntities() as $entity) {
            $payload = $entity->getPayload();
            if ($payload === null || !\is_string($payload)) {
                continue;
            }

            $payload = unserialize($payload);

            $this->enrichConditions([$payload]);