Rename index_name option to index_uid in multi_search

[ellnix]

Made a mistake when supporting this option, at least it has not made it to release yet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.54%. Comparing base (a3675cb) to head (f20a8d9).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
=======================================
  Coverage   89.54%   89.54%           
=======================================
  Files          13       13           
  Lines         775      775           
=======================================
  Hits          694      694           
  Misses         81       81           

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[ellnix]

bors merge

[meili-bors]

Build succeeded:

• integration-tests (Rails 7 with Ruby 3.2)
• integration-tests (Rails 7 with Ruby 3.3)
• integration-tests (Rails 6.1 with Ruby 3.2)
• integration-tests (Rails 7 with Ruby 3.4)
• integration-tests (Rails 6.1 with Ruby 3.4)
• integration-tests (Rails 6.1 with Ruby 3.3)
• smoke-test
• linter-check