@Override
public LocalDateDoubleTimeSeries writeDataPoints(ExternalId htsId, String dataSource, String dataProvider, String dataField,
String observationTime, LocalDateDoubleTimeSeries series) {
ObjectIdentifiable oId = _idMap.get(htsId);
if (oId == null) {
// resolve hts name to id of hts
HistoricalTimeSeriesInfoSearchRequest searchRequest = new HistoricalTimeSeriesInfoSearchRequest();
searchRequest.setExternalIdSearch(new ExternalIdSearch(htsId));