ClassificationIndex and ProductIndex values are null after we get categories

[Cozdemir]

I run following code as shown in examples. catogorySource is retrived but ProductIndex and ClassificationIndex values are null for creating a filter.

var server = new UpstreamServerClient(Endpoint.Default);
var categoriesSource = await server.GetCategories();

// Create a filter for first product and all classifications for it
var filter = new QueryFilter(
categoriesSource.ProductsIndex.Values.Take(1),
categoriesSource.ClassificationsIndex.Values);

https://microsoft.github.io/update-server-server-sync/examples/metadata_basic.html