Specification to determine under which conditions query expansion should occur.
| JSON representation | 
|---|
| {
  "condition": enum ( | 
| Fields | |
|---|---|
| condition | 
 The condition under which query expansion should occur. Default to  | 
| pinUnexpandedResults | 
 Whether to pin unexpanded results. If this field is set to true, unexpanded products are always at the top of the search results, followed by the expanded results. | 
Condition
Enum describing under which condition query expansion should occur.
| Enums | |
|---|---|
| CONDITION_UNSPECIFIED | Unspecified query expansion condition. In this case, server behavior defaults to Condition.DISABLED. | 
| DISABLED | Disabled query expansion. Only the exact search query is used, even if SearchResponse.total_sizeis zero. | 
| AUTO | Automatic query expansion built by the Search API. |