final String url = dataMap.get(fessConfig.getIndexFieldUrl()).toString();

        if (fessConfig.getIndexerClickCountEnabledAsBoolean()) {
            addClickCountField(dataMap, url, fessConfig.getIndexFieldClickCount());
        }

        if (fessConfig.getIndexerFavoriteCountEnabledAsBoolean()) {
            addFavoriteCountField(dataMap, url, fessConfig.getIndexFieldFavoriteCount());
        }

                    .boostMode(CombineFunction.MULTIPLY));
            reader.addSort(SortBuilders.fieldSort(fessConfig.getIndexFieldClickCount()));
            reader.addSort(SortBuilders.scoreSort());
            return reader;
        }, docPerReq, () -> {
            systemHelper.calibrateCpuLoad();
            ThreadUtil.sleep(interval);

                                fessConfig.getIndexFieldAnchor(), fessConfig.getIndexFieldSegment(), fessConfig.getIndexFieldExpires(),
                                fessConfig.getIndexFieldClickCount(), fessConfig.getIndexFieldFavoriteCount() });
                if (document == null) {
                    storeChildUrlsToQueue(urlQueue, getChildUrlSet(searchEngineClient, id));
                    return true;

            final SearchLogHelper searchLogHelper = ComponentUtil.getSearchLogHelper();
            final int count = searchLogHelper.getClickCount(url);
            doc.put(fessConfig.getIndexFieldClickCount(), count);
            if (logger.isDebugEnabled()) {
                logger.debug("Click count: count={}, url={}", count, url);
            }
        }
    }

    /**

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

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