private com.google.protobuf.SingleFieldBuilderV3<
            com.google.apps.events.subscriptions.v1.Subscription,
            com.google.apps.events.subscriptions.v1.Subscription.Builder,
            com.google.apps.events.subscriptions.v1.SubscriptionOrBuilder>
        getSubscriptionFieldBuilder() {
      if (subscriptionBuilder_ == null) {
        subscriptionBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.apps.events.subscriptions.v1.Subscription,
                com.google.apps.events.subscriptions.v1.Subscription.Builder,
                com.google.apps.events.subscriptions.v1.SubscriptionOrBuilder>(
                getSubscription(), getParentForChildren(), isClean());
        subscription_ = null;
      }
      return subscriptionBuilder_;
    }
<pre>
Required. The subscription resource to create.
</pre>

<code>
.google.apps.events.subscriptions.v1.Subscription subscription = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/CreateSubscriptionRequest.java