if (StringUtil.isBlank(text)) {
            return null;
        }
        final String target = getDetectText(text);
        final LanguageResult result = detector.detect(target);
        if (logger.isDebugEnabled()) {
            logger.debug("detected lang:{}({}) from {}", result, result.getRawScore(), target);
        }
        return getSupportedLanguage(result.getLanguage());
    }

    String INDEXER_LANGUAGE_FIELDS = "indexer.language.fields";

    /** The key of the configuration. e.g. 1000 */
    String INDEXER_LANGUAGE_DETECT_LENGTH = "indexer.language.detect.length";

    /** The key of the configuration. e.g. 10000 */
    String INDEXER_MAX_RESULT_WINDOW_SIZE = "indexer.max.result.window.size";

    /** The key of the configuration. e.g. 50000 */