fix: Get indexes for a specific collection

[fredcarle]

Relevant issue(s)

Resolves #3642

Description

This PR fixes a bug where the http handler for GetIndexes would call GetAllIndexes instead of collection specific indexes.

Note that the first commit documents the bug.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the repository-held documentation is changed accordingly.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).
• I made sure to discuss its limitations such as threats to validity, vulnerability to mistake and misuse, robustness to invalidation of assumptions, resource requirements, ...

How has this been tested?

make test

Specify the platform(s) on which this was tested:

• MacOS

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 78.28%. Comparing base (5b7d990) to head (ebbec09).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
http/handler_collection.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3643      +/-   ##
===========================================
- Coverage    78.41%   78.28%   -0.13%     
===========================================
  Files          408      408              
  Lines        37112    37113       +1     
===========================================
- Hits         29101    29052      -49     
- Misses        6268     6316      +48     
- Partials      1743     1745       +2     

Flag	Coverage Δ
all-tests	78.28% <50.00%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
http/handler_collection.go	71.84% <50.00%> (-0.89%)	⬇️

... and 9 files with indirect coverage changes

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[AndrewSisley]

LGTM, thanks Fred