public ISearchRequest GetSearchDescriptorForFilter(Func <SearchDescriptor <ElasticsearchProject>, SearchDescriptor <ElasticsearchProject> > create)
        {
            var descriptor = create(new SearchDescriptor <ElasticsearchProject>());
            var json       = this._client.Serializer.Serialize(descriptor);

            Console.WriteLine(json.Utf8String());
            using (var ms = new MemoryStream(json))
            {
                ISearchRequest d = this._client.Serializer.Deserialize <SearchDescriptor <ElasticsearchProject> >(ms);
                d.Should().NotBeNull();
                d.Filter.Should().NotBeNull();
                return(d);
            }
        }