Could you give this a shot?

driver.get("https://stackoverflow.com/");
WebElement element = driver.findElement(By.xpath("//span[(text()='Stack Overflow') and @class='-img _glyph']"));
WrapsDriver wrapsDriver = (WrapsDriver) element;
File screenshot = ((TakesScreenshot) wrapsDriver.getWrappedDriver()).getScreenshotAs(OutputType.FILE);
Rectangle rectangle = new Rectangle(element.getSize().width, element.getSize().height, element.getSize().height, element.getSize().width);
Point location = element.getLocation();
BufferedImage bufferedImage = ImageIO.read(screenshot);
BufferedImage destImage = bufferedImage.getSubimage(location.x, location.y, rectangle.width, rectangle.height);
ImageIO.write(destImage, "png", screenshot);
File file = new File("C:\\123.png");
FileUtils.copyFile(screenshot, file);

Based on your code experiments, the getScreenshotAs() method will capture a screenshot of the entire page.

If you need to take a screenshot of a specific WebElement within a webpage, you can utilize the AShot() method by importing the ashot-1.4.4.jar library while working with Selenium Java Client v3.14.0, ChromeDriver v2.41, and Chrome v 68.0.

Note: The AShot() method from ashot-1.4.4.jar is designed to work only with jQuery enabled Web Applications.

Therefore, since the website http://www.google.com/ does not have jQuery enabled, the AShot() method from ashot-1.4.4.jar won't be able to capture the necessary screenshot.

For demonstration purposes, let's take a snapshot from the website https://jquery.com/.

• Code Snippet:

  /* Insert your Java code here */

• Screenshot Example:

Additional Resources

You may explore further insights in the discussion at How to take screenshot with Selenium WebDriver

My current setup includes selenium-java-3.141.59 and ChromeDriver version 83.0.4103.39, and I've found the following code to be very effective:

    WebDriver driver = new ChromeDriver();
  　driver.get("https://www.google.com/");
　　WebElement element = driver.findElement(By.id("hplogo"));
　　Screenshot screenshotHeader = new AShot().coordsProvider(new WebDriverCoordsProvider()).shootingStrategy(ShootingStrategies.viewportPasting(100)).takeScreenshot(driver, element);
    try {
        ImageIO.write(screenshotHeader.getImage(),"jpg",new　File("C:/TESTSELENIUM/Google.jpg"));
    } catch (IOException e) {
        e.printStackTrace();
    }