| IndexKeysDefinitionBuilderTDocumentGeoHaystack Method (ExpressionFuncTDocument, Object, ExpressionFuncTDocument, Object) | 
 Note: This API is now obsolete.
            Creates a geo haystack index key definition.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.12.2+a4a3888f4fb51bb518b1eb5002effc2d47f2ea6a
 Syntax
Syntax[ObsoleteAttribute("GeoHaystack indexes were deprecated in server version 4.4.")]
public IndexKeysDefinition<TDocument> GeoHaystack(
	Expression<Func<TDocument, Object>> field,
	Expression<Func<TDocument, Object>> additionalFieldName = null
)<ObsoleteAttribute("GeoHaystack indexes were deprecated in server version 4.4.")>
Public Function GeoHaystack ( 
	field As Expression(Of Func(Of TDocument, Object)),
	Optional additionalFieldName As Expression(Of Func(Of TDocument, Object)) = Nothing
) As IndexKeysDefinition(Of TDocument)[<ObsoleteAttribute("GeoHaystack indexes were deprecated in server version 4.4.")>]
member GeoHaystack : 
        field : Expression<Func<'TDocument, Object>> * 
        ?additionalFieldName : Expression<Func<'TDocument, Object>> 
(* Defaults:
        let _additionalFieldName = defaultArg additionalFieldName null
*)
-> IndexKeysDefinition<'TDocument> 
Parameters
- field
- Type: System.Linq.ExpressionsExpressionFuncTDocument, Object
 The field.
- additionalFieldName (Optional)
- Type: System.Linq.ExpressionsExpressionFuncTDocument, Object
 Name of the additional field.
Return Value
Type: 
IndexKeysDefinitionTDocument
            A geo haystack index key definition.
            
 See Also
See Also