Add rate limiting for search

**Problem**
When working with store, 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. Start by locating the search implementation and the store error-handling path, then clarify the intended rate limit and descriptive error cases; done means the agreed behavior is implemented and verified.

Written by the indexing model from the issue text.