MongoDB 4.4 is the biggest release of MongoDB to date and is available in beta right now . You can try out it out in MongoDB Atlas or download the development release. There is so much new stuff to talk about ranging from new features like custom aggregation expressions, improvements to existing functionality like refinable shard keys, and much more.
In this post, we are going to look at a new feature coming to MongoDB 4.4 that will help you better optimize and fine-tune the performance of your queries as your application evolves called hidden indexes.
Hidden indexes, as the name implies, allows you to hide an index from the query planner without removing it, allowing you to assess the impact of not using that specific index.