Why does debounce () with toList () not work in RxAndroid?

Question

While I use debounce(), then I extract data from the backend and the data I want to convert to other data and finally use toList(). when I use toList()nothing happens no log is in the subscription and error, without toList()it works, and the method subscribe()enters as much as I have a list of books, I tested the second part of the code without debounce()just getItems()and with the help toList()it works. Below is my code - the first part with debounce()and itList(), which does not work, and the second c toList(), which works

public Flowable<List<Book>> getItems(String query) {}

textChangeSubscriber
            .debounce(300, TimeUnit.MILLISECONDS)
            .observeOn(Schedulers.computation())
            .switchMap(s -> getItems(s).toObservable())
            .flatMapIterable(items -> items)
            .map(Book::convert)
            .toList()
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(books -> {
                Log.i("test", "" + books.toString());
            }, error -> {
                Log.i("test", "" + error);
            });


   getItems(query).flatMapIterable(items -> items)
            .map(Book::convert)
            .toList()
            .observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io())
            .subscribe(books -> {
                Log.i("test", "" + "" + books.toString());
            }, error -> {
                Log.i("test", "" + error);
            });

Answer 1

toList , , . switchMap:

textChangeSubscriber
        .map(CharSequence::toString) // <-- text components emit mutable CharSequence
        .debounce(300, TimeUnit.MILLISECONDS)
        .observeOn(Schedulers.computation())
        .switchMap(s -> 
              getItems(s)
              .flatMapIterable(items -> items)
              .map(Book::convert)
              .toList()
              .toFlowable() // or toObservable(), depending on textChangeSubscriber
        )
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(books -> {
            Log.i("test", "" + books.toString());
        }, error -> {
            Log.i("test", "" + error);
        });