mongo-scala-driver: returning an iterator of results

Question

I am using Mongo Scala Driver to read documents from MongoDb. I have following method as follow which returns Future[List[T]]

def findAll(): List[Future[List[T]] = {
   db.getCollection(collectionName)
      .find(queryObject)
      .toFuture()
      .map{
        results => results.map(/* converting result to T */).toList
      }
}

Question:

Instead of a List, is there some way, this method can return Iterator[T] or Future[Iterator[T]] ?

The doc mentions about iterating the results via the subscribe method, but I cannot find any concrete implementation or examples of using this subscribe method to achieve my use case.