code: public WriteRequest add(Series series, DataPoint datapoint) {
      WritableDataPoint mdp = new WritableDataPoint(series, datapoint.getTimestamp(), datapoint.getValue());
      data.add(mdp);
      return this;
    }
docs: Adds a DataPoint to the request for a Series.
  @param series The Series to write to.
  @param datapoint The DataPoint to write.
  @return The updated request.
  @since 1.0.0