Aliases returned by the search server have "begin-date" and "end-date" attributes, but they lack an "ended" attribute. As such, if there's no end date, there's no way to tell if an alias returned by the search is current or not. This means we cannot hide ended primary aliases in search results like we do elsewhere.

A reasonable way to implement this would probably be having an attribute ended="ended" in the same way we currently have primary="primary" for XML, and ended: true for JSON.