View Source GoogleApi.Retail.V2.Model.GoogleCloudRetailV2SearchRequestQueryExpansionSpec (google_api_retail v0.3.0)
Specification to determine under which conditions query expansion should occur.
nil) - The condition under which query expansion should occur. Default to Condition.DISABLED.
nil) - 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.