Indexes are not being used

[foco_radiante]

Hey guys, I have my collection with the following indexes:

The problem is that no of my queries are using indexes, since it says 0 usage.
One example of query is:

Sale.aggregate([
            {
                $match: {
                    "createdAt": {
                        $gte: finalUnix
                    }
                }
            },
            {
                $project: {
                    contract: 1,
                }
            },
            {
                $group: {
                    _id: '$contract',
                    totalSales: { $sum: 1 }
                }
            },
            {
                $sort: {
                    "totalSales": -1
                }
            },
            {
                $limit: 10
            }
        ])

This query should be using the createdAt index, shouldnt?
What am I doing wrong?

[steevej (Steeve Juneau)]

@foco_radiante

This query should be using the createdAt index, shouldnt?

It should. Share the explain plan.