Index is now a descriptor

[jonesbusy]

Will be required to implement graph/copy

Description

Index is now a descriptor

Testing done

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.96%. Comparing base (7fb04b7) to head (a4111e3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #212      +/-   ##
============================================
- Coverage     84.99%   84.96%   -0.04%     
+ Complexity      439      437       -2     
============================================
  Files            33       33              
  Lines          1473     1470       -3     
  Branches        174      174              
============================================
- Hits           1252     1249       -3     
  Misses          146      146              
  Partials         75       75              

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