Error in docs for closing an issue

API docs for issues says you set parameter 'closed' to '1'.  I was not able to do that but I could set 'state_event' to 'close' which closed the issue.

Does not work
"https://gitlab.com/api/v3/projects/:id/issues/:issue_id?closed=1"

Does work
"https://gitlab.com/api/v3/projects/:id/issues/:issue_id?state_event=close"

See merge request !342