final BufferedImage thumbnail = new BufferedImage(thumbnailWidth, thumbnailHeight, image.getType());
                thumbnail.getGraphics().drawImage(image.getScaledInstance(thumbnailWidth, thumbnailHeight, Image.SCALE_AREA_AVERAGING), 0,
                        0, thumbnailWidth, thumbnailHeight, null);
                ImageIO.write(thumbnail, fessConfig.getThumbnailHtmlImageFormat(), outputFile);
                image.flush();

        document.prependChild(new DocumentType("html", "", ""));
        document.head().
                append("<meta charset='utf-8'>").
                append("<meta name='viewport' content='width=device-width, initial-scale=1'>").
                append("<title>Gradle @version@ Release Notes</title>").
                append("<link rel='stylesheet' type='text/css' href='https://assets.gradle.com/lato/css/lato-font.css'/>");