Uncomment and fix unit tests

[russcam]

Uncomment and fix unit tests for Naming Conventions https://github.com/elastic/elasticsearch-net/blob/8632fc197c01e5f8a7b89a0e9b2cc357e9163903/src/Tests/CodeStandards/NamingConventions.doc.cs

[russcam]

Added a PR #1779 for this as it's quite a sweeping set of changes 😄

[Mpdreamz]

#1779 is pulled in, thanks @russcam 👍