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_size is zero. | 
              
AUTO | 
                Automatic query expansion built by the Search API. |