public static RequestFuture<Void> voidSuccess() {
        RequestFuture<Void> future = new RequestFuture<>();
        future.complete(null);
        return future;
    }
Convert from a request future of one type to another type
@param adapter The adapter which does the conversion
@param <S> The type of the future adapted to
@return The new future
clients/src/main/java/org/apache/kafka/clients/consumer/internals/RequestFuture.java