code: public List<EventSubscriptionInner> listRegionalBySubscription(String location) {
          return listRegionalBySubscriptionWithServiceResponseAsync(location).toBlocking().single().body();
      }
docs: List all regional event subscriptions under an Azure subscription.
  List all event subscriptions from the given location under a specific Azure subscription.
  
  @param location Name of the location
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the List&lt;EventSubscriptionInner&gt; object if successful.