Update auth documentation

**Description**
Currently helpers lacks proper search support.

**Proposed solution**
Add configurable search with sensible defaults.

**Priority**: Low/Medium

Start by locating the helpers referenced in the issue and the current authentication documentation, then inspect how search is handled today. Clarify the configurable options and sensible defaults before making changes. Done means helpers support configurable search behavior and the documentation describes the available configuration.

Written by the indexing model from the issue text.