*/
    protected int numberOfReplicas = 1;

    /**
     * Prefix length for generated IDs.
     */
    protected int idPrefixLength = 445;

    /**
     * Returns the FesenClient instance, connecting if not already connected.
     * @return The FesenClient instance.
     */
    protected FesenClient getClient() {
        if (!fesenClient.connected()) {
            synchronized (fesenClient) {

            } else {
                logger.warn("Invalid index config name: configName={}", configName);
            }
        });
    }

    /**
     * Creates an HTTP client for connecting to the search engine.
     *
     * @param fessConfig the Fess configuration
     * @param host       the search engine host address
     * @return the configured HTTP client
     */