Creation of an Index By Strongly Typed Classes

I'm experimenting with creating an index but using the strongly typed classes.
The basic desire is being able to specify an index WITHOUT using C# POCO document class. A tall order I realize since I can't use Mapping Attributes or Fluent Mapping or the POCO via the AutoMapper.

The problem that I'm running into is how to create a TypeMapping object successfully so that I can set it's properties and marry it to a TypeName object.

The code below does create an index (good thing) but I can't seem to figure out how to instantiate a TypeName object (bad thing). I know I'm being dense but I'm having a helluva time since the documentation doesn't actually address using these strongly typed classes at all (or I haven't found the doc pages yet).

Any help would be appreciated.

C# Code that I'm using:

var settings = new IndexSettings();
settings.NumberOfReplicas = 0;
settings.NumberOfShards = 2;

var indexConfig = new IndexState
Settings = settings

var indexMappings = new Mappings();

var aType = new TypeName();
aType.Name = "Index Column Name;
aType.Type = typeof(string);

// A basic object but has nothing defined in it and I haven't found how to hydrate one up via a factory.
var aTypeMapping = new TypeMapping();

indexMappings.Add(aType, aTypeMapping);

var indexCreateRequest = new CreateIndexRequest(CurrentIndexName, indexConfig);
indexCreateRequest.Mappings = indexMappings;

var aResponse = Client.CreateIndex(indexCreateRequest);

And the index that's created:

"dynamicindex-28-09-2017-19-26-14": {
"aliases": {
"dynamicindex": {}
"mappings": {
"FirstName": {},
"Email": {},
"LastName": {},
"Age": {}
"settings": {
"index": {
"creation_date": "1506626774660",
"number_of_shards": "2",
"number_of_replicas": "0",
"uuid": "rVNvrRcJQrmTxfV7JDczXA",
"version": {
"created": "5060199"
"provided_name": "dynamicindex-28-09-2017-19-26-14"

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