code: @VisibleForTesting
    void updateLastModifiedTime(final Path path) {
      try {
        Files.setLastModifiedTime(path, FileTime.fromMillis(System.currentTimeMillis()));
      } catch (final IOException ex) {
        log.warn("Error when updating last modified time for {}", path, ex);
      }
    }
docs: Update last modified time of the file if it exists.
  
  @param path path to the target file