}

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override
            public String getIndexFieldHasCache() {
                return "has_cache";
            }

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

                                .getDocumentListByDocIds(clickCountMap.keySet().toArray(new String[clickCountMap.size()]),
                                        new String[] { fessConfig.getIndexFieldDocId(), fessConfig.getIndexFieldLang() },
                                        OptionalThing.of(FessUserBean.empty()), SearchRequestType.ADMIN_SEARCH)
                                .stream()
                                .map(doc -> {

            }

            @Override
            public String getIndexFieldConfigId() {
                return "config_id";
            }

            @Override
            public String getIndexFieldLang() {
                return "lang";
            }

            @Override
            public String getIndexFieldHasCache() {
                return "has_cache";
            }

            }

            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),

     * The value is, e.g. lang <br>
     * comment: Field name for language in the index.
     * @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>
     * comment: Field name for cache status in the index.