code: public PubsubFuture<Subscription> createSubscription(final String project,
                                                         final String subscriptionName,
                                                         final String topic) {
      return createSubscription(canonicalSubscription(project, subscriptionName), canonicalTopic(project, topic));
    }
docs: Create a Pub/Sub subscription.
  
  @param project          The Google Cloud project.
  @param subscriptionName The name of the subscription to create.
  @param topic            The name of the topic to subscribe to.
  @return A future that is completed when this request is completed.