feat: remove more unused indices

[aeneasr]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.59%. Comparing base (53874c1) to head (ad0062f).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
driver/registry_default.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4186      +/-   ##
==========================================
+ Coverage   78.57%   78.59%   +0.01%     
==========================================
  Files         380      380              
  Lines       27114    27113       -1     
==========================================
+ Hits        21306    21309       +3     
+ Misses       4190     4188       -2     
+ Partials     1618     1616       -2     

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