Setting up mongo client to decode document result into bson.M (instead of the default bson.D) for empty interface

[Vimal Patel]

I have a use case that requires me to decode document(s) result retrieved from calls to MongoDB via the Go Mongo driver into an empty/generic interface. The Mongo client by default returns the decoded result as a bson.D; however I need it to be returned as a bson.M so that I can output the decoded contents into our desired JSON structure. I have attempted various solutions including one provided in the comments for https://jira.mongodb.org/browse/GODRIVER-988 that involves setting the Mongo client registry to return bson.M instead of bson.D without success. I have attached small go program with instructions included as commented out lines towards the top of the program for you to reproduce this issue. My guess is that I am not setting the registry for the mongo client correctly, hence I am not getting the desired result.