express mongoose : getting aggregate returns empty array - express

Question

Dears,
I'm having trouble in getting back mongoDB aggregation, using mongoose.
The query in MongoDB is sending back data, but the call from mongoose always returns empty array
UPDATE
I found the fix, I have to add a 3rd parameter when setting the model
const RawData = mongoose.model('rawdata', rawDataSchema, 'rawdata');
Here is the code
Schema rawdata.js
import mongoose from 'mongoose';
const rawDataSchema = new mongoose.Schema({
Email: String,
Nb: Number,
Licences: String,
Licence_ret: String,
Pays: String,
Share: String,
Pack: String,
Quota_in_MB: Number,
Webmail_Ext: Number, });
const RawData = mongoose.model('rawdata', rawDataSchema);
export default RawData;
index.js - edited after first feedbacks
import express from 'express';
import mongoose from 'mongoose';
import RawData from 'rawdata'
const app = express();
app.get('/test', async (req, res) => {
const data = await RawData.aggregate(
[
{ "$group": { _id: { license: "$Licence_Carrefour" }, count: { $sum: 1 } } },
{
$project: {
_id: 0,
License: "$_id.license",
count: 1
}
}
]);
console.log('data', data)
res.send('hello')
});
(async () => {
await mongoose.connect(dbURI, { useNewUrlParser: true }, err => {
if (err) console.log('\x1b[31m%s', 'DB is not connected');
console.log('connected to database ');
});
app.listen(APP_PORT, () => console.log('app up'));
})();