if (viewHelper != null && !docMap.isEmpty()) {
                        docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
                        docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));
                        docMap.put(fessConfig.getResponseFieldUrlLink(), viewHelper.getUrlLink(docMap));

            logger.debug("Thumbnail generator is not found: {}", docMap != null ? docMap.get("url") : docMap);
        }
        return false;
    }

    protected String getImageFilename(final Map<String, Object> docMap) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String docid = DocumentUtil.getValue(docMap, fessConfig.getIndexFieldDocId(), String.class);

            if (source != null) {
                final Map<String, Object> docMap = new HashMap<>(source);
                docMap.put(fessConfig.getIndexFieldId(), hit.getId());
                docMap.put(fessConfig.getIndexFieldVersion(), hit.getVersion());
                docMap.put(fessConfig.getIndexFieldSeqNo(), hit.getSeqNo());
                docMap.put(fessConfig.getIndexFieldPrimaryTerm(), hit.getPrimaryTerm());

        }
        buf.append(segment);
        return buf.toString();
    }

    public Object getSitePath(final Map<String, Object> docMap) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final Object siteValue = docMap.get(fessConfig.getIndexFieldSite());
        if (siteValue != null) {
            final String site = siteValue.toString();