docs: public static void createTopic(Pubsub client, String fullTopicName)
        throws IOException {
      System.out.println("fullTopicName " + fullTopicName);
      try {
          client.projects().topics().get(fullTopicName).execute();
      } catch (GoogleJsonResponseException e) {
        if (e.getStatusCode() == HttpStatusCodes.STATUS_CODE_NOT_FOUND) {
          Topic topic = client.projects().topics()
                  .create(fullTopicName, new Topic())
                  .execute();
          System.out.printf("Topic %s was created.%n", topic.getName());
        }
      }
    }