More errors should be retryable. See spec changes below : 

• https://github.com/mongodb/specifications/commit/7021f759c4c2a918808660a2e4e55ba1f4e4acb5 

• https://github.com/mongodb/specifications/commit/cc89c2e4bf1916f2fdc1be16676fa0009796e540

Add retryable error codes & code names to write retry logic
Expand write retry cases
Review server source for additional write retry messages not in current spec
Expand change stream resume cases
Write change stream resume tests
Make change streams retry on getMore only
Review read retry code

Test cases:

Retry on a non-write concern error
Fail on a non-write concern error
Retry on a write concern error
Fail on a write concern error
Retry on change stream initiation
Fail on change stream initiation
Retry on change stream getMore
Fail on change stream getMore