Gearing up for new dev cycle

Moving to custom made .NET Elasticsearch client because the official one introduces is too hard  to use
Squashed 'NElasticsearch/' content from commit 30b1710

git-subtree-dir: NElasticsearch
git-subtree-split: 30b1710ae105caf56214f0cf8814fd998efe695b
Merge commit 'f2c425efb126b9fb8ff4c0feda8504fe1044c45f' as 'NElasticsearch'
Using NElasticsearch
Adding NuGet.exe