Server Wire version indicating supported features https://github.com/mongodb/specifications/blob/master/source/wireversion-featurelist.rst
Pre 2.6 (-2.4)
Server version 2.6
Server version 3.0
Server version 3.2
Server version 3.4
Server version 3.6
Server version 4.0
Server version 4.2
See Implementation
Server Wire version indicating supported features https://github.com/mongodb/specifications/blob/master/source/wireversion-featurelist.rst