Getting faceted results via reflection on 2.x version of elastica bundle.

SearchController.php

    <?php
    /**
     * @param Pagerfanta $paginatedResults
     * @return array|null
     */
    protected function getFacetsFromPaginatedResults(Pagerfanta $paginatedResults, $offset, $limit)
    {
        $paginatedAdapter = $paginatedResults->getAdapter();

        $adapter = new \ReflectionProperty($paginatedAdapter, 'adapter');
        $adapter->setAccessible(true);

        /** @var TransformedPaginatorAdapter $transformedAdapter */
        $transformedAdapter = $adapter->getValue($paginatedAdapter);

        return $transformedAdapter->getResults($offset, $limit)->getFacets();
    }