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    SearchHint

    Represents a hint to the search index engine.

    JSON representation 
     { 
 // Union field index_type 
can be only one of the following: 
 "useIndex" 
 : 
 { 
 object (  IndexHint 
 
) 
 } 
 , 
 "useKnn" 
 : 
 boolean 
 // End of list of possible types for union field index_type 
. 
 }
    Fields
    Union field index_type . The type of index to use. index_type can be only one of the following:
    useIndex

    object ( IndexHint )

    Optional. Specifies that the search should use a particular index.

    useKnn

    boolean

    Optional. If set to true, the search will use the system's default K-Nearest Neighbor (KNN) index engine.

    IndexHint

    Message to specify the index to use for the search.

    JSON representation 
     { 
 "name" 
 : 
 string 
 }
    Fields
    name

    string

    Required. The resource name of the index to use for the search. The index must be in the same project, location, and collection. Format: projects/{project}/locations/{location}/collections/{collection}/indexes/{index}

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