I find the way to create Nest elasticSearch client which contains default index with my custom analyzer. I know that I can create the client with default index and type name. I looks like this:
ElasticClient client = new ElasticClient(new ConnectionSettings(new Uri("http://localhost:9200"))
.DefaultIndex("my_index_name")
.DefaultTypeNameInferrer(type => "my_type_name"));
But I don't know how to assign custom analyzer to default index at the same time. Is it possible?