new String[] { fessConfig.getIndexFieldId(), fessConfig.getIndexFieldDocId() });
            for (final Map<String, Object> doc : docs) {
                final Object oldIdValue = doc.get(fessConfig.getIndexFieldId());
                if (oldIdValue != null && !idValue.equals(oldIdValue)) {
                    final Object oldDocIdValue = doc.get(fessConfig.getIndexFieldDocId());
                    if (oldDocIdValue != null) {

    }

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

    protected String getImageFilename(final String docid) {
        final StringBuilder buf = new StringBuilder(50);

            final BoolQueryBuilder boolQuery =
                    QueryBuilders.boolQuery().must(QueryBuilders.termQuery(fessConfig.getIndexFieldDocId(), docId));
            final Set<String> roleSet = ComponentUtil.getRoleQueryHelper().build(SearchRequestType.JSON); // TODO SearchRequestType?
            final QueryHelper queryHelper = ComponentUtil.getQueryHelper();

            }
        }

        if (documentBoost > 0) {
            addBoostValue(map, documentBoost);
        }

        if (!map.containsKey(fessConfig.getIndexFieldDocId())) {
            map.put(fessConfig.getIndexFieldDocId(), systemHelper.generateDocId(map));
        }

        ComponentUtil.getLanguageHelper().updateDocument(map);
    }

            flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(ScoreFunctionBuilders.randomFunction()
                    .seed(ComponentUtil.getSystemHelper().getCurrentTimeAsLong()).setField(fessConfig.getIndexFieldDocId())));
            reader.setQuery(QueryBuilders
                    .functionScoreQuery(QueryBuilders.matchAllQuery(),

            final List<Map<String, Object>> docList = searchHelper.getDocumentListByDocIds(docIds, new String[] {
                    fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldDocId(), fessConfig.getIndexFieldFavoriteCount() },
                    OptionalThing.empty(), SearchRequestType.JSON);
            List<String> urlList = new ArrayList<>(docList.size());

        String url = DocumentUtil.getValue(document, fessConfig.getIndexFieldUrl(), String.class);

        if (StringUtil.isBlank(url)) {
            return "#not-found-" + DocumentUtil.getValue(document, fessConfig.getIndexFieldDocId(), String.class);
        }

        final boolean isSmbUrl = url.startsWith("smb:") || url.startsWith("smb1:");
        final boolean isFtpUrl = url.startsWith("ftp:");

     * Get the value for the key 'index.field.doc_id'. <br>
     * The value is, e.g. doc_id <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldDocId();

    /**
     * Get the value for the key 'index.field.id'. <br>
     * The value is, e.g. _id <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)