Solution: Create a Compound Index

/* Find an order's detail */
db.orders.find({
  customerId: "f9437b18a248488827a75532",
  orderDate: { $gte: ISODate("2025-01-01T00:00:00Z") }
}).sort({ orderDate: -1 }).explain("executionStats"),
/*Create the compound index here*/
db.orders.createIndex(
  { 
    customerId: 1, 
    orderDate: -1 
  }
),
/* Now, again find an order's detail */
db.orders.find({
  customerId: "f9437b18a248488827a75532",
  orderDate: { $gte: ISODate("2025-01-01T00:00:00Z") }
}).sort({ orderDate: -1 }).explain("executionStats")