langFields = fessConfig.getIndexerLanguageFieldsAsArray();
        supportedLanguages = fessConfig.getSupportedLanguagesAsArray();
        maxTextLength = fessConfig.getIndexerLanguageDetectLengthAsInteger();
    }

    /**
     * Updates a document with language information.
     *
     * @param doc The document to update.
     */
    public void updateDocument(final Map<String, Object> doc) {