We have an accounts collection with the following document structure: { _id: ObjectId("5ca4bbc7a2dd94ee5816239d"), account_id: 864905, limit: 10000, products: [ 'Commodity', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239e"), account_id: 299072, limit: 10000, products: [ 'InvestmentFund', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239f"), account_id: 137994, limit: 10000, products: [ 'CurrencyService', 'InvestmentStock' ] } We need to use Aggregation Framework to find the distribution of products field. Sort the result set by decreasing total number of products. Expected output: [ { _id: 'InvestmentStock', total: 1746 }, { _id: 'CurrencyService', total: 742 }, { _id: 'Brokerage', total: 741 }, { _id: 'InvestmentFund', total: 728 }, { _id: 'Commodity', total: 720 }, { _id: 'Derivatives', total: 706 } ] Which pipeline should you use?