/// <summary>
/// Reads up events up to the last one available. Pre-loads the projection from its cache,
/// if available, to reduce the necessary work.
/// </summary>
public async Task InitializeAsync(CancellationToken cancel = default(CancellationToken))
{
var log = _log.Timestamped();
await Catchup(_projection, Stream, cancel);
// Start reading everything
log?.Info("[ES init] catching up with stream.");
await CatchUpAsync(cancel).ConfigureAwait(false);
log?.Info("[ES init] DONE !");
}