.net core 如何向elasticsearch中创建索引，插入数据。

首先我们要建一个webapi工程，然后下载两个插件：

 1，Nest        2，Elasticsearch.Net

 下载后，下面就上代码了，首先是elasticsearchHelp帮助类

using Elasticsearch.Net;
using Nest;
using System;
namespace ESAPI.Common
{
    public static class ElasticSearchHelper
    {

        public static  readonly string url = "http://ip:9200/";//这个是elasticsearch远程访问ip
        public static  void insert(object t,string index)
        {
            //设置连接字符串，DefaultIndex中的表名要小写
            var settings = new ConnectionSettings(new Uri(url)).DefaultIndex(index);
            var client = new ElasticClient(settings);
            var doc = t;
            //通过 IndexDocument() 方法插入数据
            var ndexResponse = client.IndexDocument(doc);
        }
        /// <summary>
        /// 单点链接到ElasticSearch
        /// </summary>
        /// <param name="url">ElasticSearch的ip地址</param>
        /// <returns></returns>
        public static ElasticClient OneConnectES(string url)
        {

            var node = new Uri(url);
            var settings = new ConnectionSettings(node);
            var client = new ElasticClient(settings);
            return client;
        }
        /// <summary>
        /// 指定多个节点使用连接池链接到Elasticsearch集群
        /// </summary>
        /// <param name="serverurl">链接ip数组</param>
        /// <returns></returns>
        public static ElasticClient ManyConnectES(string[] serverurl)
        {
            Uri[] nodes = new Uri[serverurl.Length];
            for (int i = 0; i < serverurl.Length; i++)
            {
                nodes[i] = new Uri(serverurl[i]);
            }
            var pool = new StaticConnectionPool(nodes);
            var settings = new ConnectionSettings(pool);
            var client = new ElasticClient(settings);
            return client;
        }
        /// <summary>
        /// 创建索引
        /// </summary>
        /// <param name="elasticClient"></param>
        public static CreateIndexResponse CreateIndex(this IElasticClient elasticClient, string indexName, int numberOfReplicas = 1, int numberOfShards = 5)
        {
            IIndexState indexState = new IndexState
            {
                Settings = new IndexSettings
                {
                    NumberOfReplicas = numberOfReplicas,
                    // [副本数量]
                    NumberOfShards = numberOfShards
                }
            };
            Func<CreateIndexDescriptor, ICreateIndexRequest> func = x => x.InitializeUsing(indexState).Map(m => m.AutoMap());
            CreateIndexResponse response = elasticClient.Indices.Create(indexName, func);
            return response;
        }
    }
}

控制器代码：

using System;
using ESAPI.Common;
using Microsoft.AspNetCore.Mvc;
namespace ESAPI.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
         /// <summary>
         /// 删除地址
         /// </summary>
         /// <param name="id"></param>
         [HttpGet("InsertLog")]
         public void InsertLog()
         {
          //插入200条数据
            for (int i = 0; i < 200; i++)
            {
                var d = new
                {
                    Time = DateTime.Now,
                    Num = 5,
                    Name = "12313",
                    info = "hello world!"
                };
                ElasticSearchHelper.insert(d, "demo");

            }
           
        }
        
    }
}

运行程序：

 查看elasticsearch可视化界面：

很显然，插入成功了！既然是ELK，后续我还会对logstash，Kibana的安装和使用也进行详细的介绍，下一篇，会详细介绍logstash的安装和使用！