Search Response Listener, add additional info

[khusseini]

Hello there,

I was trying to find a "nice" way to enrich a document with additional data from other data sources, so the first spot to look at was the ongr_filter_manager.search_response event.

  SearchBundle\EventListener\EsSearchResponseListener:
    arguments:
    - '@search.indexer.object_repository'
    tags:
    - name: kernel.event_listener
      event: ongr_filter_manager.search_response

class EsSearchResponseListener
{
    /** @var SearchIndexerInterface */
    private $indexer;

    public function __construct(SearchIndexerInterface $indexer)
    {
        $this->indexer = $indexer;
    }

    public function onOngrfiltermanagerSearchresponse(SearchResponseEvent $event)
    {
        $documents = $event->getDocumentIterator();
        $config = $this->indexer->getConfig();

        foreach ($documents as $document) {
            if (!$document instanceof TypedContent) {
                continue;
            }

            if (
                !in_array(get_class($document), array_keys($config))
                || !in_array($document->getType(), array_keys($config[get_class($document)]))
            ) {
                continue;
            }

            $conf = $config[get_class($document)][$document->getType()];

            /** @var ObjectRepository $repository */
            $repository = $conf['repository'];
            $obj = $repository->findOneBy([
                $config['identifier'] => $document->getId()
            ]);

            $document->setDataObject($obj);
        }
    }
}

it was only after I wrote this, that I realized that the entries for the the results are not changed outside of the listeners scope.
What would be a good way to achieve something like this?
Are there maybe any events fired when the results are converted from their raw form to the document object?