How do I fetch what startpage (in a multisite) a document belongs to?.
I want to index all mediadata with its belonging startpage id so that I can filter this site per site.
AFAIK type in index already has partent chain path with ids - but for denormalization you can try to include StartPgeId field or so in indexable fields.
SearchClient.Instance.Conventions.ForInstancesOf<PageData>().IncludeField(x => x.StartPageId());
public static string StartPageId(this PageData content)
// travel by ParentLink to find top most parent (StartPage) or fetch StartPage from repository directly
Then you can use this field to query for content for specific site.