code: public final void deleteSubscription(String subscription) {
  
      DeleteSubscriptionRequest request =
          DeleteSubscriptionRequest.newBuilder().setSubscription(subscription).build();
      deleteSubscription(request);
    }
docs: Deletes an existing subscription. All messages retained in the subscription are immediately
  dropped. Calls to `Pull` after deletion will return `NOT_FOUND`. After a subscription is
  deleted, a new one may be created with the same name, but the new one has no association with
  the old subscription or its topic unless the same topic is specified.
  
  <p>Sample code:
  
  <pre><code>
  try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
  ProjectSubscriptionName subscription = ProjectSubscriptionName.of("[PROJECT]", "[SUBSCRIPTION]");
  subscriptionAdminClient.deleteSubscription(subscription.toString());
  }
  </code></pre>
  
  @param subscription The subscription to delete. Format is
  `projects/{project}/subscriptions/{sub}`.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails