public abstract Task<IAsyncCursor<TResult>> AggregateAsync<TResult>(
	PipelineDefinition<TDocument, TResult> pipeline,
	AggregateOptions options = null,
	CancellationToken cancellationToken = null
)

Public MustOverride Function AggregateAsync(Of TResult) ( 
	pipeline As PipelineDefinition(Of TDocument, TResult),
	Optional options As AggregateOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of IAsyncCursor(Of TResult))

abstract AggregateAsync : 
        pipeline : PipelineDefinition<'TDocument, 'TResult> * 
        ?options : AggregateOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<IAsyncCursor<'TResult>>