upgrade from 2.14.8 to 3.10.0 may prevent download of rubygems hosted repository gems

I just upgraded from 2.14.8 to 3.10.0 and used the upgrade capability. One of my repositories holds hosted ruby gems. The actual migration mostly worked - the gems were in the new version of Nexus, but bundler and gem could not find them. I would get errors like "Could not find a valid gem"

I tried using both the group repo (which proxied rubygems.org and held my hosted) as well as my hosted repo. While using the group, I was able to pull gems from rubygems.org.

The Nexus API listed all gems correctly. I was able to work around this by using the API to loop through all gems, download them, delete them from Nexus, and then I re-submitted them to nexus using the nexus gem. Once I did that, bundler and gem were able to find the gems succesfully.

It appears as though metadata was lost during the transfer. Not sure exactly what.

Sonatype added Acceptance Criteria

• Verify this works with an uncompressed index as well as the compressed solution