Support search configuration

**Problem**
When working with routes, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No file, test, or entry point is named. First reconcile the title's search-configuration request with the body’s route error-message suggestion, then identify the relevant routing and error-handling entry points; done should mean a specifically defined configuration behavior and more descriptive errors covered by tests.

Written by the indexing model from the issue text.