protected DiskFileItemFactory createDiskFileItemFactory() {
        final int sizeThreshold = getSizeThreshold();
        final File repository = createRepositoryFile();
        return DiskFileItemFactory.builder().setBufferSize(sizeThreshold).setFile(repository).get();
    }

    protected int getSizeThreshold() {
        return ComponentUtil.getFessConfig().getHttpFileuploadThresholdSizeAsInteger();
    }

            ftpClient.setConnectTimeout(connectTimeout);
            ftpClient.setDataTimeout(Duration.ofMillis(dataTimeout));
            ftpClient.setControlEncoding(controlEncoding);
            ftpClient.setBufferSize(bufferSize);
            if (passiveNatWorkaround) {
                ftpClient.setPassiveNatWorkaroundStrategy(new NatServerResolverImpl(ftpClient));
            }
            ftpClient.setUseEPSVwithIPv4(useEPSVwithIPv4);