use test1
db.restaurantReviewsMultiple.insertMany( [
{
      date: ISODate("2021-03-08"),
      restaurant: "Joe's Pizza",
      score: 90
   },
   {
      date: ISODate("2021-03-08"),
      restaurant: "Sally's Deli",
      score: 75
   }
] )
db.restaurantReviewsMultiple.aggregate( [
   {
      $fill:
         {
            sortBy: { date: 1 },
            partitionBy: { "restaurant": "$restaurant" },
            output:
               {
                  "score": { method: "linear" }
               }
         }
   }
] )
MongoServerError: PlanExecutor error during aggregation :: caused by :: There can be no repeated values in the sort field