Description

Pretty minor, but SERVER-10637 started returning connectionId in isMaster as of MongoDB 4.2. The C# and java drivers now use this, but it doesn't appear documented on either https://docs.mongodb.com/manual/reference/command/isMaster/ or in https://github.com/mongodb/specifications.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)