fessConfig.getIndexFieldContentLength(), //
                    fessConfig.getIndexFieldHost(), //
                    fessConfig.getIndexFieldSite(), //
                    fessConfig.getIndexFieldLastModified(), //
                    fessConfig.getIndexFieldTimestamp(), //
                    fessConfig.getIndexFieldMimetype(), //
                    fessConfig.getIndexFieldFiletype(), //

                }
                final Map<String, Object> document = indexingHelper.getDocument(searchEngineClient, id,
                        new String[] { fessConfig.getIndexFieldId(), fessConfig.getIndexFieldLastModified(),
                                fessConfig.getIndexFieldAnchor(), fessConfig.getIndexFieldSegment(), fessConfig.getIndexFieldExpires(),

        final String indexFieldBoost = fessConfig.getIndexFieldBoost();
        final String indexFieldRole = fessConfig.getIndexFieldRole();
        final String indexFieldLastModified = fessConfig.getIndexFieldLastModified();
        final String indexFieldTimestamp = fessConfig.getIndexFieldTimestamp();
        final String indexFieldLang = fessConfig.getIndexFieldLang();

        // last_modified
        final Date lastModified = getLastModified(dataMap, responseData);
        if (lastModified != null) {
            dataMap.put(fessConfig.getIndexFieldLastModified(), lastModified); // overwrite
            // timestamp
            putResultDataBody(dataMap, fessConfig.getIndexFieldTimestamp(), lastModified);
        } else {
            // timestamp

        // last_modified
        final Date lastModified = responseData.getLastModified();
        if (lastModified != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldLastModified(), lastModified);
            // timestamp
            putResultDataBody(dataMap, fessConfig.getIndexFieldTimestamp(), lastModified);
        } else {
            // timestamp

     * The value is, e.g. last_modified <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldLastModified();

    /**
     * Get the value for the key 'index.field.anchor'. <br>
     * The value is, e.g. anchor <br>