fix: `logger.warning` -> `logger.warn`

[invakid404]

Description

This PR fixes a typo in the search service that references a non-existent logger method.

Related Issue

Fixes #2690.

Motivation and Context

It allows twake-node to be deployed without a search service.

How Has This Been Tested?

I've successfully deployed twake-node locally without configuring a search service.

Screenshots (if appropriate):

N/A

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added the Signed-off-by statement at the end of my commit message.

[RomaricMourgues]

Hi, thank you very much for this fix, could you rebase the PR to the develop branch ? Romaric

[invakid404]

Hi, thank you very much for this fix, could you rebase the PR to the develop branch ? Romaric

Sure thing, it's done :^)