public static StorageClient createClient(final FessConfig fessConfig) {
        final String endpoint = fessConfig.getStorageEndpoint();
        final String accessKey = fessConfig.getStorageAccessKey();
        final String secretKey = fessConfig.getStorageSecretKey();
        final String bucket = fessConfig.getStorageBucket();

        // Get explicit type or auto-detect
        final String typeStr = fessConfig.getStorageType();