A GeoElement that represents aggregated geoelement on the map, for example a cluster of features or graphics. Based on aggregation properties defined in AggregationFeatureReduction, geoelements are aggregated dynamically as the scale of the map changes. AggregateGeoElement.attributes are the summary statistics defined at the time of configuring aggregation on a FeatureLayer. AggregateGeoElement.geometry is a GeometryType.Point representing the centroid of the aggregated geoelement. By default, AggregateGeoElement will have a cluster_count attribute. Aggregated geoelements only have access to the AggregationFeatureReduction.aggregateFields defined. The fields from the feature layer are not accessible for use in popups, labels, or renderers for aggregated geoelements.