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. Start by locating route handling and the current error-message paths, then clarify what search configuration must support and which detailed errors are expected. Done means the requested search configuration is supported and route failures provide the agreed descriptive messages.

Written by the indexing model from the issue text.