public async Task UpsertDocument(SmallDocumentWithLargeAttachment doc, LargeDocument attachment)
            {
                var upsertResult = await StoreClient.UpsertDocumentAsync(doc, _smallMapping, new OperationOptions());

                await StoreClient.CreateAttachmentAsync(doc, upsertResult.DocumentVersion, _attachmentMapping, attachment);
            }
 public async Task UpsertDocument(LargeDocument document)
 {
     await StoreClient.UpsertDocumentAsync(document, _largeMapping, new OperationOptions());
 }