code: public ServiceFuture<EventSubscriptionInner> updateAsync(String scope, String eventSubscriptionName, EventSubscriptionUpdateParameters eventSubscriptionUpdateParameters, final ServiceCallback<EventSubscriptionInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(scope, eventSubscriptionName, eventSubscriptionUpdateParameters), serviceCallback);
      }
docs: Update an event subscription.
  Asynchronously updates an existing event subscription.
  
  @param scope The scope of existing event subscription. The scope can be a subscription, or a resource group, or a top level resource belonging to a resource provider namespace, or an EventGrid topic. For example, use '/subscriptions/{subscriptionId}/' for a subscription, '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}' for a resource group, and '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/{resourceProviderNamespace}/{resourceType}/{resourceName}' for a resource, and '/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.EventGrid/topics/{topicName}' for an EventGrid topic.
  @param eventSubscriptionName Name of the event subscription to be updated
  @param eventSubscriptionUpdateParameters Updated event subscription information
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object