Covering index for $group/$sum in MongoDB aggregation (with hint)

MongoDB's latest enhancements to its aggregation framework, particularly with the $group and $sum operations, are making waves in the tech community. By leveraging indexes, users can now achieve significantly faster performance, especially with the DISTINCT_SCAN optimization. This is crucial for developers and businesses that rely on efficient data processing, as it not only speeds up queries but also improves overall application performance. As MongoDB continues to innovate, these advancements highlight its commitment to providing powerful tools for data management.