Fix legacy options leaking into request headers

[kimpepper]

Description

Legacy options like $params['client']['verbose'] = true; in IndicesNamespace are leaking into the headers that we send with the HTTP request. We should remove them.

Issues Resolved

#301

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.87%. Comparing base (6e63822) to head (e1e9c62).
Report is 23 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #310      +/-   ##
============================================
+ Coverage     23.57%   23.87%   +0.29%     
- Complexity     3614     3623       +9     
============================================
  Files           534      538       +4     
  Lines         13797    13856      +59     
============================================
+ Hits           3253     3308      +55     
- Misses        10544    10548       +4     

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