// TODO date
        // lang
        if (StringUtil.isNotBlank(fessConfig.getCrawlerDocumentFileDefaultLang())) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldLang(), fessConfig.getCrawlerDocumentFileDefaultLang());
        }
        // id
        putResultDataBody(dataMap, fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));
        // parentId

                throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "No searched urls.");
            }

            searchHelper.getDocumentByDocId(docId, new String[] { fessConfig.getIndexFieldUrl(), fessConfig.getIndexFieldLang() },
                    OptionalThing.empty()).ifPresent(doc -> {
                        final String favoriteUrl = DocumentUtil.getValue(doc, fessConfig.getIndexFieldUrl(), String.class);

                getSingleNodeValue(document, getLangXpath(fessConfig, xpathConfigMap), node -> pruneNode(node, crawlingConfig)));
        if (lang != null) {
            putResultDataBody(dataMap, fessConfig.getIndexFieldLang(), lang);
        }
        // title
        // content
        final String body = getSingleNodeValue(document, getContentXpath(fessConfig, xpathConfigMap),

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

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