*
     * @return the maximum number of history messages
     */
    protected int getMaxHistoryMessages() {
        final int value = ComponentUtil.getFessConfig().getRagChatHistoryMaxMessagesAsInteger();
        if (value <= 0) {
            logger.warn("Invalid max history messages: {}. Using default: 20", value);
            return 20;
        }
        return value;
    }

    /**

     *
     * @return the maximum number of history messages
     */
    protected int getMaxHistoryMessages() {
        return ComponentUtil.getFessConfig().getRagChatHistoryMaxMessagesAsInteger();
    }

    /**
     * Searches for documents relevant to the user's query.
     * Delegates to the multi-argument variant with empty filters.
     *
     * @param query the search query

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getRagChatHistoryMaxMessagesAsInteger();

    /**
     * Get the value for the key 'rag.chat.content.fields'. <br>
     * The value is, e.g. title,url,content,doc_id,content_title,content_description <br>
     * comment: <br>