Using the Collections UI to create an alias makes a call like this:
http://$HOST:8983/solr/admin/collections?_=1461358635047&action=CREATEALIAS&collections=%5Bobject+Object%5D&name=assets&wt=json
The collections param is effectively [object Object] which is clearly wrong, and should be a comma separated list of collections.
SOLR-8585 Create Alias in Collection view of new Admin UI not working
SOLR-8592 Create collection alias from New UI doesn't actually work