java -> kotlin problem

javatokotlin.java

private final Observable.Transformer<Observable, Observable> mSchedulersTransformer =
            observable -> observable.subscribeOn(Schedulers.newThread())
                    .observeOn(AndroidSchedulers.mainThread());

@SuppressWarnings("unchecked")
private <T> Observable.Transformer<T, T> applySchedulers() {
    return (Observable.Transformer<T, T>) mSchedulersTransformer;
}