public void LoadData(IEnumerable <Build> builds)
{
var waitHandle = new CountdownEvent(1);
var bulkAll = client.BulkAll(builds, b => b
.Index <Build>()
.BackOffRetries(2)
.BackOffTime("30s")
.MaxDegreeOfParallelism(4)
.Size(1000)
);
bulkAll.Subscribe(new BulkAllObserver(
onNext: (b) => { Console.Write("."); },
onError: (e) => throw e,
onCompleted: () => waitHandle.Signal()
));
}