resolvePreviews example

new ProductCollection(),
                $aggregations,
                $origin,
                $context->getContext()
            );
        }

        $mapping = array_combine($keys, $keys);

        $hasOptionFilter = $this->hasOptionFilter($criteria);
        if (!$hasOptionFilter) {
            $mapping = $this->resolvePreviews($keys, $context);
        }

        $event = new ProductListingResolvePreviewEvent($context, $criteria, $mapping, $hasOptionFilter);
        $this->eventDispatcher->dispatch($event);
        $mapping = $event->getMapping();

        $read = $criteria->cloneForRead(array_values($mapping));
        $read->addAssociation('options.group');

        $searchResult = $this->productRepository->search($read, $context);