code: static String shortenPathName(Path path, int bytes) {
      String pathString = path.toUri().getPath();
      String replaced = pathString.replace("/", "_");
  
      if (replaced.length() <= bytes) {
        return replaced;
      }
  
      int bytesPerHalf = (bytes - 3) / 2;
      return replaced.substring(0, bytesPerHalf) + "..." + replaced.substring(replaced.length() - bytesPerHalf);
    }
docs: Shorten an absolute path into a sanitized String of length at most bytes. This is useful for including a summary
  of an absolute path in a file name.
  
  <p>
  For example: shortenPathName("/user/gobblin/foo/bar/myFile.txt", 25) will be shortened to "_user_gobbl..._myFile.txt".
  </p>
  
  @param path absolute {@link Path} to shorten.
  @param bytes max number of UTF8 bytes that output string can use (note that,
  for now, it is assumed that each character uses exactly one byte).
  @return a shortened, sanitized String of length at most bytes.