Alef/simplifynugets

[afederici75]

Motivation and Context (Why the change? What's the scenario?)

Here's the new PR with the additional tests I could not easily port yesterday.
I had to touch the Elasticsearch project, but there shouldn't be any conflict. I am not sure why it says it cannot merge automatically....
Details below.

High level description (Approach, Design)

Changes in Elasticsearch:

-Removed all Free Mind Labs, Inc. copyright in both extension and test project.
-Refactored IndexNameHelper and turned it into a static class. This removed a lot of unnecessary complexity and arguments.
-Adjusted ElasticsearchMemoryDb to the changes in IndexNameHelper.	

Elasticsearch.UnitTests

-Removed Usings.cs
-Created MemoryDbFunctionalTest which descends from KM's BaseFunctionalTestCase, thus providing access to configuration and other common things.
-Refactored all tests to inherit from MemoryDbFunctionalTest and be consitent with KM's.	

All Elasticsearch tests pass:
-DefaultTests (11)
-Additional (35)

[afederici75]

I am going to merge this into the current main and then post a new PR for this.