Cleaning up unused indicies

[mintsoft]

trafficstars

• Resolves: #5520
• Target version: main

Summary

Adding migration to cleanup these unused indicies; I have absolutely no idea what is going on with the naming convention on the filename/class so I've made something up.

Checklist

• [x] Code is properly formatted
• [x] Sign-off message is added to all commits
• [x] Tests (unit, integration, api and/or acceptance) are included
• [x] Documentation (manuals or wiki) has been updated or is not required

[mintsoft]

All done

[mintsoft]

@juliushaertl polite reminder about this PR, I've just rebased and such so it's ready

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