*
     * @return the session timeout in minutes
     */
    protected int getSessionTimeoutMinutes() {
        final int value = ComponentUtil.getFessConfig().getRagChatSessionTimeoutMinutesAsInteger();
        if (value <= 0) {
            logger.warn("Invalid session timeout: {}. Using default: 30", value);
            return 30;
        }
        return value;
    }

    /**

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

    /**
     * Get the value for the key 'rag.chat.session.max.size'. <br>
     * The value is, e.g. 10000 <br>