src/main/java/io/reactivex/Observable.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> hide() {
        return RxJavaPlugins.onAssembly(new ObservableHide<T>(this));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> hide() {
        return RxJavaPlugins.onAssembly(new ObservableHide<T>(this));
    }
Hides the identity of this Observable and its Disposable.
<p>Allows hiding extra features such as {@link io.reactivex.subjects.Subject}'s
{@link Observer} methods or preventing certain identity-based
optimizations (fusion).
<p>
<img width="640" height="283" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/hide.o.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>{@code hide} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>
@return the new Observable instance

@since 2.0