You can now use
client.Raw.IndicesCreatePost("myIndexName", myJsonSettings, nv=>nv);
myJsonSettings can be a string or anonymous c# object. The last argument is optional but allows you to pass any querystring value you might need.
Question
I'm trying to upgrade from Nest .10 to .12, but don't see what call I need to substitute for client.CreateIndexRaw("myIndexName", myJsonSettings).
Solution
You can now use
client.Raw.IndicesCreatePost("myIndexName", myJsonSettings, nv=>nv);
myJsonSettings can be a string or anonymous c# object. The last argument is optional but allows you to pass any querystring value you might need.