变更1 字段类型string
- 2.x中仅有String类型，可设置是否分词、是否索引及分词使用的分词器。
- 5.x中拆分为Keyword类型与Text类型，Keyword 不分词，可设置是否索引；Text分词，可设置是否索引及分词使用的分词器。
???????[String(Name = "Name",Index = FieldIndexOption.NotAnalyzed)] ???????public string Name { get; set; } ????????[String(Name = "Dic", Index = FieldIndexOption.Analyzed,Analyzer = "ik_max_word")] ??????????/// <summary> ???????/// keyword 不分词 ???????/// </summary> ???????[Keyword(Name = "Name", Index = true)] ???????public string Name { get; set; } ????????/// <summary> ???????/// text 分词,Analyzer = "ik_max_word" ???????/// </summary> ???????[Text(Name = "Dic", Index = true, Analyzer = "ik_max_word")] ???????public string Dic { get; set; }注：5.x已将string标记为过时特性，下个版本将移除；
变更2 滚动扫描获取全量数据
滚动扫描支持并行执行提高获取数据效率；
2.x
public void SearchScanScroll(string indexName) ???????{ ???????????string scrollid = ""; ???????????var result = _client.Search<TestModel2>(s => s.Index(indexName).Query(q => q.MatchAll()) ???????????????.Size(10) ???????????????//todo:2x中的SearchType.Scan，5.x移除 ???????????????.SearchType(SearchType.Scan) ???????????????.Scroll("1m")); ???????????scrollid = result.ScrollId; ???????????int count = 0; ???????????while (true) ???????????{ ???????????????//得到滚动扫描的id ???????????????//执行滚动扫描得到数据 返回数据量是 result.Shards.Successful*size(查询成功的分片数*size) ???????????????var result1 = _client.Scroll<TestModel2>("1m", scrollid); ???????????????if(result1.Documents==null || !result1.Documents.Any()) ???????????????????break; ???????????????foreach (var info in result1.Documents) ???????????????{ ???????????????????count++; ????????????????Console.WriteLine(info.Id+" - "+ count); ??????????????????} ???????????????//得到新的id ???????????????scrollid = result1.ScrollId; ???????????} ???????}5.x
Action<int> sc1 = (id) => ???????????{ ???????????????string scrollid = ""; ???????????????//todo:5.x 多了Slice设置 移除SearchType.Scan ???????????????var result = _client.Search<TestModel5>(s => s.Index(indexName).Query(q => q.MatchAll()) ???????????????????.Size(15) ???????????????????.Sort(st=>st.Descending(ds=>ds.Id)) ???????????????????.Scroll("1m") ???????????????????//id从0开始 0,1,2... ???????????????????//length=max ???????????????????//例：max=3 id=0,id=1,id=2 ???????????????????.Slice(sl => sl.Id(id).Max(3)) ???????????????????); ????????????????//得到滚动扫描的id ???????????????scrollid = result.ScrollId; ???????????????foreach (var info in result.Documents) ???????????????{ ???????????????????Console.WriteLine(info.Id + " - " + " -批次count " + result.Documents.Count + " - 线程"+Thread.CurrentThread.ManagedThreadId); ???????????????} ???????????????while (true) ???????????????{ ???????????????????//执行滚动扫描得到数据 返回数据量是 result.Shards.Successful*size(查询成功的分片数*size) ???????????????????var result1 = _client.Scroll<TestModel5>("1m", scrollid); ???????????????????if (result1.Documents == null || !result1.Documents.Any()) ???????????????????????break; ???????????????????foreach (var info in result1.Documents) ???????????????????{ ???????????????????????Console.WriteLine(info.Id + " - " +" -批次count "+ result1.Documents.Count+ " - 线程" + Thread.CurrentThread.ManagedThreadId); ???????????????????} ???????????????????//得到新的id ???????????????????scrollid = result1.ScrollId; ???????????????} ???????????}; ??????????var t1= Task.Factory.StartNew(() => { sc1(0); }); ???????????var t2= Task.Factory.StartNew(() => { sc1(1); }); ???????????var t3= Task.Factory.StartNew(() => { sc1(2); }); ???????????t1.Wait(); ???????????t2.Wait(); ???????????t3.Wait();注：5.x 增加了Slice设置可并行拉取全量数据，移除SearchType.Scan，首次查询Search时也返回结果，2.x中设置SearchType.Scan首次Search只返回ScrollId。
注：5.x中新增深度分页方案深度分页
分组结果对象 Nest.KeyedBucket
- 2.x KeyedBucket
- 5.x KeyedBucket<object>
聚合结果解析
2.x
??????????var vendorIdGroup = (BucketAggregate)result.Aggregations["Group_Group"]; ???????????foreach (var bucket1 in vendorIdGroup.Items) ???????????{ ???????????????//todo:2.x KeyedBucket ????????????????var bucket = (KeyedBucket)bucket1; ???????????????var maxPrice = ((ValueAggregate)bucket.Aggregations["Dvalue_Max"]).Value; ???????????}5.x
???????????var vendorIdGroup = (BucketAggregate)result.Aggregations["Group_Group"]; ???????????foreach (var bucket1 in vendorIdGroup.Items) ???????????{ ???????????????//todo:5.x KeyedBucket<T> ????????????????var bucket = (KeyedBucket<object>) bucket1; ???????????????var maxPrice = ((ValueAggregate)bucket.Aggregations["Dvalue_Max"]).Value; ???????????}其它
一些新的特性或接口会持续补充。
elasticsearch_.net_client_nest2.x_到_5.x常用方法属性差异
原文地址：http://www.cnblogs.com/huhangfei/p/7516367.html