FindIterable.map().first() does not seem to close the underlying cursor

With the current MappingIterable.first() implementation:

@Nullable@Overridepublic V first() {
MongoCursor<V> iterator = iterator();
if (!iterator.hasNext()) {
return null;
}
return iterator.next();
}

It seems that the MongoCursor.close() method is not called on a col.find().map().first() call.

HTH