Sharing Saved Objects developer guide: Step 4

This step demonstrate the changes to update the saved object type
registration, which will cause this isolated object type to be converted
to become share-capable during the 8.0 upgrade process.

Note: the previous steps can be backported to 7.x, but this step cannot
be backported, because the conversion cannot take place before 8.0.

x-pack/plugins/notes_test/server/saved_objects.ts

@@ -22,5 +22,6 @@ const noteSavedObjectType: SavedObjectsType<NoteAttributes> = {
     getTitle: ({ attributes }) => attributes.subject,
   },
   mappings: { dynamic: false, properties: {} },
-  namespaceType: 'single',
+  namespaceType: 'multiple-isolated',
+  convertToMultiNamespaceTypeVersion: '8.0.0',
 };