Indexes
Indexes improve query performance by allowing Amazon DocumentDB to quickly locate documents without scanning every document in a collection. You can create indexes on fields that your application queries frequently to reduce latency and I/O costs.
For additional index-related topics, see:
Managing Amazon DocumentDB indexes — creating and building indexes
Working with indexes — indexing best practices
Troubleshooting indexes — resolving index build failures and bloat
How do I analyze index usage and identify unused indexes? — finding unused and missing indexes