eZ\Publish\Core\Search\Common\Slot\AbstractSubtree::indexSubtree PHP Method

    protected function indexSubtree($locationId)
    {
        $contentHandler = $this->persistenceHandler->contentHandler();
        $locationHandler = $this->persistenceHandler->locationHandler();
        $processedContentIdSet = array();
        $subtreeIds = $locationHandler->loadSubtreeIds($locationId);
        foreach ($subtreeIds as $locationId => $contentId) {
            $this->searchHandler->indexLocation($locationHandler->load($locationId));
            if (isset($processedContentIdSet[$contentId])) {
                continue;
            }
            $this->searchHandler->indexContent($contentHandler->load($contentId, $contentHandler->loadContentInfo($contentId)->currentVersionNo));
            // Content could be found in multiple Locations of the subtree,
            // but we need to (re)index it only once
            $processedContentIdSet[$contentId] = true;
        }
    }