Not possible to GET most recently updated repositories. (BB-15714)

According the new API doc, we can sort repository list with "update on":

https://confluence.atlassian.com/bitbucket/version-2-423626329.html#Version2-Sortingqueryresults

However, the query for "https://bitbucket.org/api/2.0/repositories/username?sort=-updated_on" is not working as of now, producing the error:

"Repository has no field named 'last_update'"

Perhaps the docs need to be updated as well?