| Name | Type | Description | Notes |
|---|---|---|---|
| query_string | string | The search query string in KQL (Keyword Query Language) format. The query string can contain free-text keywords and property filters. Examples: - `budget report`: free text search - `mediatype:audio`: filter by media type - `audio.artist:"Saxon"`: filter by audio metadata - `audio.genre:Rock AND audio.year:1979`: combined filters |