createFacets example

public function search(SearchBundle\Criteria $criteria, ShopContextInterface $context)
    {
        $query = $this->queryBuilderFactory->createProductQuery($criteria, $context);

        $products = $this->getProducts($query);

        $total = \count($products);
        if ($criteria->fetchCount()) {
            $total = $this->getTotalCount($query);
        }

        $facets = $this->createFacets($criteria, $context);

        return new SearchBundle\ProductNumberSearchResult($products, (int) $total, $facets);
    }

    /** * @return array */
    private function getProducts(QueryBuilder $query)
    {
        $data = $query->execute()->fetchAll(PDO::FETCH_ASSOC);
        $products = [];