Implement GET /users/autocomplete endpoint for APIv4 (#5742)

api4/api.go

@@ -92,7 +92,7 @@ func InitApi(full bool) {
 	BaseRoutes.ApiRoot = app.Srv.Router.PathPrefix(model.API_URL_SUFFIX).Subrouter()
 
 	BaseRoutes.Users = BaseRoutes.ApiRoot.PathPrefix("/users").Subrouter()
-	BaseRoutes.User = BaseRoutes.Users.PathPrefix("/{user_id:[A-Za-z0-9]+}").Subrouter()
+	BaseRoutes.User = BaseRoutes.ApiRoot.PathPrefix("/users/{user_id:[A-Za-z0-9]+}").Subrouter()
 	BaseRoutes.UserByUsername = BaseRoutes.Users.PathPrefix("/username/{username:[A-Za-z0-9\\_\\-\\.]+}").Subrouter()
 	BaseRoutes.UserByEmail = BaseRoutes.Users.PathPrefix("/email/{email}").Subrouter()