Handle edge cases in search

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

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

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

Start by locating the search handlers and their current error-message paths; the issue does not name files or tests. Trace how handler failures are surfaced, identify the edge cases that currently produce vague messages, and confirm completion with focused tests or reproducible searches showing detailed errors.

Written by the indexing model from the issue text.