Get data from datapoint when tap

Question

`function startClustering(map, data) {
  var dataPoints = data.map(function (item) {
    return new H.clustering.DataPoint(item.latitude, item.longitude,null,item.vehicleId);
  });`

Here I want to get item.vehicleId.

When I click a cluster, need to get data associated with data points. If a cluster contains 10 then, I want the vehicleId associated with those 10 data.

Note: This is default theme.