final StringBuilder resultBuf = new StringBuilder();

        // clean up
        final QueryBuilder queryBuilder = QueryBuilders.rangeQuery(fessConfig.getIndexFieldExpires()).to("now");
        try {
            searchEngineClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), queryBuilder);

        } catch (final Exception e) {

                    if (documentExpires != null
                            && !indexingHelper.updateDocument(searchEngineClient, id, fessConfig.getIndexFieldExpires(), documentExpires)) {
                        logger.debug("Failed to update field: field={}, url={}", fessConfig.getIndexFieldExpires(), url);
                    }

                    return false;
                }
            } finally {

                final QueryBuilder expiresCheckQuery = QueryBuilders.boolQuery()//
                        .mustNot(QueryBuilders.rangeQuery(fessConfig.getIndexFieldExpires()).gt("now"))//
                        .mustNot(QueryBuilders.existsQuery(fessConfig.getIndexFieldExpires()));
                queryBuilder.must(expiresCheckQuery);
            }

            try {

            defaultDataMap.put(fessConfig.getIndexFieldConfigId(), configId);
        }
        //  expires
        if (documentExpires != null) {
            defaultDataMap.put(fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // segment
        defaultDataMap.put(fessConfig.getIndexFieldSegment(), initParamMap.getAsString(Constants.SESSION_ID));
        // created

                    fessConfig.getIndexFieldContentLength(), //
                    fessConfig.getIndexFieldCreated(), //
                    fessConfig.getIndexFieldDocId(), //
                    fessConfig.getIndexFieldExpires(), //
                    fessConfig.getIndexFieldFavoriteCount(), //
                    fessConfig.getIndexFieldFiletype(), //
                    fessConfig.getIndexFieldFilename(), //

            putResultDataBody(dataMap, fessConfig.getIndexFieldConfigId(), configId);
        }
        //  expires
        if (documentExpires != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // segment
        putResultDataBody(dataMap, fessConfig.getIndexFieldSegment(), sessionId);
        // content

            putResultDataBody(dataMap, fessConfig.getIndexFieldConfigId(), configId);
        }
        //  expires
        if (documentExpires != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldExpires(), documentExpires);
        }
        // lang
        final String lang = systemHelper.normalizeHtmlLang(

     * comment: Field name for expiration date in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldExpires();

    /**
     * Get the value for the key 'index.field.url'. <br>
     * The value is, e.g. url <br>
     * comment: Field name for URL in the index.