code: @Override
      public FutureAppendable performAppends(int timeout, TimeUnit unit) throws IOException, HttpErrorPage,
              TimeoutException {
          return this.futureBuilder.performAppends(timeout, unit);
      }
docs: /*
  (non-Javadoc)
  
  @see org.esigate.parser.future.FutureAppendable#performAppends(int, java.util.concurrent.TimeUnit)