Unable to search on belongs_to association ID in mongoid

[mltsy]

I have a Classification model, whose instances belong_to a ClientProduct. ClientProduct has_one Classification. I have enabled querying by this association with:

configure :client_product do
  queryable true
end

But when I'm on the list view for Classifications, and I type in a ClientProduct id to search by, nothing is returned. If I select the ClientProduct filter, and say "is exactly" with the same ID, it returns the correct product. But I should be able to query by the ID using the search box as well, right?

May be related to this issue (duplicate?): #1849