try to add merge operation to aggregation pipeline

backend/routes/routesToucan.js

@@ -22,7 +22,7 @@ const urltoucans = Toucan.aggregate([
         {urlId:
             {$concat:["$titlelcnospace","-","$year"]}}}, 
     {$unset:["titlelc","year","titlelcnospace","title","date"]}, 
-    {$merge : "urls"}
+    {$out: "urls"}
 ]);
 
 router.route("/toucans")
@@ -139,21 +139,6 @@ router.route("/img/:id")
         }
     });
 
-/* router.route("/pdf/:urlID")
-    .get(celebrate({params: validURL}), function(req,res) {
-        urltoucans.match({urlID: req.params.urlID}, (err,data) => {
-            if (err) {
-                res.end(500);
-                return;
-            } 
-            else if (!data) {
-                res.status(404).send("Toucan non trouvé");
-                return;
-            }
-            //const id = data._id;
-            //res.sendFile(path.resolve(env.savedExtensions[1].path,id+".pdf"));
-        }
-        );}); */
 
 router.get('/pdf/:urlId', (req, res) => {
         try {  
@@ -174,20 +159,5 @@ router.get('/pdf/:urlId', (req, res) => {
             }
           });
 
-router.get('/pdf/url', (req, res) => {
-            try {  
-                  urltoucans.
-                  exec((err,data) => {
-                    if (err) {
-                      console.log(err);
-                      
-                    } else {
-                      res.json(data);
-                  }});
-                } catch (err) {
-                  console.log(err);
-                  res.sendStatus(401);
-                }
-              });
     
 module.exports = router;
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