Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Serilog;
using Serilog.Events;
using Serilog.Sinks.Elasticsearch;

namespace ElasticCore
{
    public class Startup
    {
         public Startup(IConfiguration configuration)
        { 
            // Create Serilog Elasticsearch logger
            Log.Logger = new LoggerConfiguration()
               .Enrich.FromLogContext()
               .MinimumLevel.Debug()
               .WriteTo.Elasticsearch(new ElasticsearchSinkOptions(new Uri("http://localhost:9200"))
               {
                   MinimumLogEventLevel = LogEventLevel.Verbose,
                   AutoRegisterTemplate = true
               })
               .CreateLogger();
 
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddLogging(loggingBuilder => loggingBuilder.AddSerilog(dispose: true));
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            new LoggerFactory().AddConsole(Configuration.GetSection("Logging"));
            new LoggerFactory().AddDebug();
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseMvc();
        }
    }
}