src/main/java/io/reactivex/Flowable.java
@CheckReturnValue
    @BackpressureSupport(BackpressureKind.FULL)
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Flowable<T> rebatchRequests(int n) {
        return observeOn(ImmediateThinScheduler.INSTANCE, true, n);
    }
@CheckReturnValue
    @BackpressureSupport(BackpressureKind.FULL)
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Flowable<T> rebatchRequests(int n) {
        return observeOn(ImmediateThinScheduler.INSTANCE, true, n);
    }
Requests {@code n} initially from the upstream and then 75% of {@code n} subsequently
after 75% of {@code n} values have been emitted to the downstream.

<p>This operator allows preventing the downstream to trigger unbounded mode via {@code request(Long.MAX_VALUE)}
or compensate for the per-item overhead of small and frequent requests.

<dl>
<dt><b>Backpressure:</b></dt>
<dd>The operator expects backpressure from upstream and honors backpressure from downstream.</dd>
<dt><b>Scheduler:</b></dt>
<dd>{@code rebatchRequests} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>

@param n the initial request amount, further request will happen after 75% of this value
@return the Publisher that rebatches request amounts from downstream
@since 2.0