@java.lang.Override
  protected Builder newBuilderForType(com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
    Builder builder = new Builder(parent);
    return builder;
  }
<pre>
Optional. If set to `true`, validates and previews the request, but doesn't
create the subscription.
</pre>

<code>bool validate_only = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The validateOnly.
java-workspaceevents/proto-google-cloud-workspaceevents-v1/src/main/java/com/google/apps/events/subscriptions/v1/CreateSubscriptionRequest.java