How to find queries not using indexes or slow in mongodb

Question

is there a way to find queries in mongodb that are not using Indexes or are SLOW? In MySQL that is possible with the following settings inside configuration file:

Answer 1

In case somebody ends up here from Google on this old question, I found that explain really helped me fix specific queries that I could see were causing COLLSCANs from the logs.

Example:

db.collection.find().explain()

This will let you know if the query is using a COLLSCAN (Basic Cursor) or an index (BTree), among other things.

https://docs.mongodb.com/manual/reference/method/cursor.explain/