code: private void handleExceptions() throws RetriesExhaustedWithDetailsException {
      RetriesExhaustedWithDetailsException exceptions = getExceptions();
      if (exceptions != null) {
        listener.onException(exceptions, this);
      }
    }
docs: Create a {@link RetriesExhaustedWithDetailsException} if there were any async exceptions and
  send it to the {@link org.apache.hadoop.hbase.client.BufferedMutator.ExceptionListener}.