the underlying java DistinctObservable
Sets the collation options
the collation options to use
Requires MongoDB 3.4 or greater,
A null value represents the server default.
Sets the query filter to apply to the query.
the filter, which may be null.
Sets the maximum execution time on the server for this operation.
Observable to start streaming data.
Handles the automatic boxing of a Java
Observable so it conforms to the interface.
Observer that will consume signals from this
Users should not have to implement this method but rather use the Scala