For those of us who integrate with other systems and use the alias to store other system ids, it would be useful to search constituents by this alias.  Users can already do this via the UI.  An example need is: two records were merged in another system.  ID "B" was merged into ID "A".  There is a constituent in Raiser's Edge NXT with an alias that has value "B".  That value must be updated to value "A".  To automate via Sky API, we need to query for constituents where alias = "B".  Then we would use the Alias endpoint to change the alias for that constituent to "A".  This cannot be done today with the current Sky API