RT
https://qbox.io/blog/author/sloan-ahrens

nest驱动访问ES，按照官网文档，使用如下程序可以正常索引：
static void Main()
        {
            var node = new Uri("http://localhost:9200");

            var settings = new ConnectionSettings(
                node,
                defaultIndex: "my-application"
            );
            var client = new ElasticClient(settings);
            var person = new Person
            {
                Id = "1",
                Firstname = "Martijn",
                Lastname = "Laarman"
            };
            var index = client.Index(person);
        }
调整为手动设置indexName时出错，示例代码如下：
static void Main()
        {
            var node = new Uri("http://localhost:9200");

            var settings = new ConnectionSettings(
                node,
                defaultIndex: "my-application"
            );
            settings.MapDefaultTypeIndices(d => d.Add(typeof(Person), "constIndex"));
            var client = new ElasticClient(settings);
            var person = new Person
            {
                Id = "1",
                Firstname = "Martijn",
                Lastname = "Laarman"
            };
            var index = client.Index(person);
        }
出错提示为：
{StatusCode: 400,
 Method: PUT,
 Url: http://localhost:9200/constIndex/automobile/1,
 Request: {
  "firstname": "Martijn",
  "lastname": "Laarman",
  "id": "1"
},
 Response: <Response stream not captured or already read to completion by serializer, set ExposeRawResponse() on connectionsettings to force it to be set on>}
 
 

using System;

using Nest;



namespace ConsoleApplication1

{

    class Program

    {

        private static IIndexResponse Index<T>(T person, string indexName) where T : class

        {

            var node = new Uri("http://localhost:9200&quot;);



            var settings = new ConnectionSettings(node,defaultIndex: indexName);

            var client = new ElasticClient(settings);

            return client.Index(person);

        }



        static void Main()

        {

            string indexNameError = typeof(Person).FullName

                .Substring(typeof(Person).FullName.LastIndexOf(".", StringComparison.Ordinal) + 1) + "Indexs";

            const string indexNameOk = "test";

            var person = new Person

            {

                Id = "1",

                Firstname = "Martijn",

                Lastname = "Laarman"

            };

            var ok = Index(person, indexNameOk);

            Console.WriteLine("Result:" + ok.IsValid);

            var error = Index(person, indexNameError);

            Console.WriteLine("Result:" + error.IsValid);

            Console.ReadKey();

        }

       

    }



   [Serializable]

    public class Person

    {

        public string Firstname { get; set; }

        public string Lastname { get; set; }

        public string Id { get; set; }

    }

}