如何使用NEST Bulk Api將文檔添加到Elasticsearch

Question

我是Elasticsearch的新手。 我需要使用NEST api使用批量選項插入文檔。

我必須從表中索引5000個文檔。 以下是我用於批量索引編制的代碼。

public ActionResult CreateBulk()
        {            

            var descriptor = new BulkDescriptor();          

            foreach (var test in db.Attendance.Take(5000).ToList())
            {
                descriptor.Index<Attendance>(op => op.Document(new Attendance
                {
                    AttendanceId = test.AttendanceId,
                    AttendanceDate = test.AttendanceDate,
                    Estate = test.Estate,
                    Division = test.Division,
                    FieldNo = test.FieldNo,
                    Employee = test.Employee,
                    Activity = test.Activity,
                    Quantity = test.Quantity
                }));                
            }
            var bulkresult = ElasticClient.Bulk(descriptor);
            return RedirectToAction("Index");
        }

但是，當我運行代碼時，出現以下錯誤：

System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Nest
  StackTrace:
       at Nest.NestSerializer.SerializeBulkDescriptor(IBulkRequest bulkRequest) in c:\Users\gmarz\code\elasticsearch-net\src\Nest\ExposedInternals\NestSerializer.cs:line 166
       at Nest.ElasticClient.<Bulk>b__1b6(ElasticsearchPathInfo`1 p, BulkDescriptor d) in c:\Users\gmarz\code\elasticsearch-net\src\Nest\ElasticClient-Bulk.cs:line 31
       at Nest.ElasticClient.Dispatch[D,Q,R](D descriptor, Func`3 dispatch) in c:\Users\gmarz\code\elasticsearch-net\src\Nest\ElasticClient.cs:line 82
       at Nest.ElasticClient.Dispatch[D,Q,R](Func`2 selector, Func`3 dispatch) in c:\Users\gmarz\code\elasticsearch-net\src\Nest\ElasticClient.cs:line 70
       at Nest.ElasticClient.Bulk(Func`2 bulkSelector) in c:\Users\gmarz\code\elasticsearch-net\src\Nest\ElasticClient-Bulk.cs:line 27
       at AttendancePOC.Controllers.AttendanceController.CreateBulk() in D:\GIT Source\ElasticSearch\AttendancePOC\AttendancePOC\Controllers\AttendanceController.cs:line 114
       at lambda_method(Closure , ControllerBase , Object[] )
       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41()
       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _)
       at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End()
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult)
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33()
       at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49()
  InnerException:

請幫助我。我的代碼有什么問題嗎？

Answer 1

我有同樣的問題。 我忘了為此查詢設置索引名稱。 我已經設置了一個配置，該配置在創建新的ElasticClient的過程中設置了默認索引，但是配置發生了變化，並且我的索引為null。

希望能有所幫助

Answer 2

我有這個問題，解決辦法是包括defaultIndex財產ConnectionSettings如說在這里例如：

var node = new Uri("http://something:9200");
var settings = new ConnectionSettings(node, "someDefaultIndexValue");
var client = new ElasticClient(settings);

Answer 3

我做這樣的事情：

        var node = new Uri(elasticSearchURI);
        var connectionPool = new SniffingConnectionPool(new[] { node });
        var config = new ConnectionSettings(connectionPool)
                                .SniffOnConnectionFault(false)
                                .SniffOnStartup(false)
                                .SetTimeout(600000)
                                .DisablePing();
        var EsClient = new ElasticClient(config);

然后，我創建索引，然后使用類似以下的內容：

        List<Categories> categList = new List<Categories>();

        if (categoriesData != null)
        {
            Parallel.ForEach(categoriesData, element =>
            {
                Categories inf = new Categories();

                inf.Code = element.Code;
                inf.Level = element.Level;

                lock(categList)
                {
                    categList.Add(inf);
                }

            });

            EsClient.IndexMany<Categories>(categList,"index_name","type_name")
        }

Answer 4

請添加像這樣的默認索引connectionSettings = new ConnectionSettings（connectionPool）.DefaultIndex（“ indexname”）