* Gets the maximum session cache size.
     *
     * @return the maximum session cache size
     */
    protected int getMaxSessionSize() {
        final int value = ComponentUtil.getFessConfig().getRagChatSessionMaxSizeAsInteger();
        if (value <= 0) {
            logger.warn("Invalid max session size: {}. Using default: 100", value);
            return 100;
        }
        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 getRagChatSessionMaxSizeAsInteger();

    /**
     * Get the value for the key 'rag.chat.history.max.messages'. <br>
     * The value is, e.g. 30 <br>