createIndices example

        /** @var array<string> $entities */
        $entities = array_keys($this->indexer);

        if ($indexingBehavior->getOnlyEntities()) {
            $entities = array_intersect($entities, $indexingBehavior->getOnlyEntities());
        } elseif ($indexingBehavior->getSkipEntities()) {
            $entities = array_diff($entities, $indexingBehavior->getSkipEntities());
        }

        $indices = $this->createIndices($entities);

        foreach ($entities as $entityName) {
            $indexer = $this->getIndexer($entityName);
            $iterator = $indexer->getIterator();

            $this->dispatcher->dispatch(new ProgressStartedEvent($indexer->getName(), $iterator->fetchCount()));

            while ($ids = $iterator->fetch()) {
                $ids = array_values($ids);

                // we provide no queue when the data is sent by the admin