I want to assign the output of an aggregate function to a variable in node js

Question

Here is my code:

app.get('/getRecommendation', async (req, res) => {
  
    
  let test=await movie_data.aggregate([
    {
      $match: {
        "vote_average": { $not: { $type: "string" } },
        "vote_count": { $not: { $type: "string" } },
        "genres": req.query.genres,
        "_id":{$ne:monk.id(req.query._id)}
      }
    },
    {
      $project: {
        original_title: 1,
        vote_average: 1,
        vote_count: 1,
        overview:1,
        release_date:1,
        genres:1,
        distance: {
          $sqrt: {
            $add: [
              { $pow: [{ $subtract: [Number(req.query.vote_average), "$vote_average"] }, 2] },
              { $pow: [{ $subtract: [Number(req.query.vote_count), "$vote_count"] }, 2] }
            ]
          }
        }
      }
    },
    {
      $match: {
        distance: { $ne: null }
      }
    },
    {
      $sort: { distance: 1 },
    },
    {
      $limit: 5
    }
  ])
  
  console.log(test)


  
})

The output of console.log(test) is an empty array.

I tried different assigning methods, but none of them works and I made sure to make the assignment in an asynchronous way but the output is still empty.