private void importFessJson(final String fileName, final File tempFile) {
        try (final InputStream in = new FileInputStream(tempFile); final OutputStream out = Files.newOutputStream(getFessJsonPath())) {
            CopyUtil.copy(in, out);
        } catch (final IOException e) {
            logger.warn("Failed to process fess.json file: {}", fileName, e);
        } finally {
            deleteTempFile(tempFile);
        }
    }