Elasticsearch.Net.Aws.AwsHttpConnection.SignRequest C# (CSharp) Method

        private void SignRequest(IRequest request, RequestData requestData)
        {
            byte[] data = null;
            if (requestData.PostData != null)
            {
                data = requestData.PostData.WrittenBytes;
                if (data == null)
                {
                    using (var ms = new MemoryStream())
                    {
                        requestData.PostData.Write(ms, requestData.ConnectionSettings);
                        data = ms.ToArray();
                    }
                }
            }
            SignV4Util.SignRequest(request, data, _credentials, _region, "es");
        }