Fix search request missing a slash when no indices are given

[Jakob3xD]

Description

Add missing / for search requests when not searching specific indices.

Issues Resolved

Closes #470

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[Jakob3xD]

Draft as I am waiting for a reply on the issue to maybe adjust the integration tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.29%. Comparing base (609bfef) to head (427bb04).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #471   +/-   ##
=======================================
  Coverage   57.29%   57.29%           
=======================================
  Files         315      315           
  Lines        9823     9823           
=======================================
  Hits         5628     5628           
  Misses       2902     2902           
  Partials     1293     1293           

Flag	Coverage Δ
integration	50.83% <100.00%> (ø)
unit	12.84% <0.00%> (ø)

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

Files	Coverage Δ
opensearchapi/api_search.go	100.00% <100.00%> (ø)

[dblock]

Definitely needs tests! Thanks for fixing this.

[dblock]

@Jakob3xD Want to finish this?

[Jakob3xD]

@Jakob3xD Want to finish this?

Well, I can mark it as ready but I have no idea for testing this in a useful way for all endpoints.
We could add a unit test for each endpoint creating a requests and calling the GetRequest() function and check the URL if it stats with a /. But I am not sure this works.

[dblock]

@Jakob3xD Want to finish this?

Well, I can mark it as ready but I have no idea for testing this in a useful way for all endpoints. We could add a unit test for each endpoint creating a requests and calling the GetRequest() function and check the URL if it stats with a /. But I am not sure this works.

I would at a minimum add a test for this specific endpoint (this bug). But something that iterates over all APIs would be better.