code: public void deleteFile(String fileId) throws IOException {
      Preconditions.checkNotNull(fileId, "fileId is required");
      Path p = new Path(fileId);
      if (LOG.isDebugEnabled()) {
        LOG.debug("Deleting path: " + p + " , fileId: " + fileId);
      }
      fileSystem.delete(p, true);
    }
docs: Permanently delete the file from Google drive (skipping trash)
  @param path
  @throws IOException