public virtual OnIndexAnnotationChangedNode VisitOnIndexAnnotationChanged(OnIndexAnnotationChangedNode node) => node;
 public override OnIndexAnnotationChangedNode VisitOnIndexAnnotationChanged(OnIndexAnnotationChangedNode node)
 {
     Dispatcher._immediateConventionScope.OnIndexAnnotationChanged(
         node.IndexBuilder, node.Name, node.Annotation, node.OldAnnotation);
     return(null);
 }