public Builder clearNotificationEndpoint() {
      bitField0_ = (bitField0_ & ~0x00000080);
      notificationEndpoint_ = null;
      if (notificationEndpointBuilder_ != null) {
        notificationEndpointBuilder_.dispose();
        notificationEndpointBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. Immutable. The endpoint where the subscription delivers events,
such as a Pub/Sub topic.
</pre>

<code>
.google.apps.events.subscriptions.v1.NotificationEndpoint notification_endpoint = 7 [(.google.api.field_behavior) = REQUIRED, (.google.api.field_behavior) = IMMUTABLE];
</code>
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/Subscription.java