Add configuration options for search

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

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

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

The issue names no files, tests, or entry points. First clarify which search configuration options and model error messages are required, then locate the relevant search and error-handling entry points. Done should be defined by agreed behavior and tests for the requested options and messages.

Written by the indexing model from the issue text.