使用Nest Client在Elasticsearch中将嵌套属性复制到父对象

这是你怎么做

private static void Main(){    var defaultIndex = "my_index";    var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));    var settings = new ConnectionSettings(pool)        .DefaultIndex(defaultIndex);    var client = new ElasticClient(settings);    if (client.IndexExists(defaultIndex).Exists)        client.DeleteIndex(defaultIndex);    var createIndexResponse = client.CreateIndex(defaultIndex, c => c        .Settings(s => s .NumberOfShards(1) .NumberOfReplicas(0)        )        .Mappings(m => m .Map<Person>(mm => mm     .AutoMap()     .Properties(p => p         .Object<Address>(o => o  .Name(n => n.Address)  .AutoMap()  .Properties(pp => pp      .Text(t => t          .Name(nn => nn.Street)          .CopyTo(co => co   .Field(Infer.Field<Person>(ff => ff.Search))          )      )  )         )     ) )        )    );    var indexResponse = client.Index(new Person        { LastName = "foo", Address = new Address {     Street = "bar" }        } , i => i        .Refresh(Refresh.WaitFor)    );    var searchResponse = client.Search<Person>(s => s        .Query(q => q .Match(m => m     .Field(f => f.Search)     .Query("bar") )        )    );}public class Person{    public string Search { get; set; }    public string LastName { get; set; }    public Address Address { get; set; }}public class Address{    public string Street { get; set; }}

本质上

1. 自动映射

   Person

   属性
2. 显式将

   Address

   属性映射到

   Person

3. 自动映射

   Address

   属性
4. 明确映射该

   Street

   属性并进行设置

   CopyTo(...)

   。此时，泛型类型参数是

   Address

   类型，因此您需要使用

   Nest.Infer.Field<T>

   来访问的

   Search

   属性

   Person

   ，或使用字符串。

搜索返回期望的文档

{  "took" : 2,  "timed_out" : false,  "_shards" : {    "total" : 1,    "successful" : 1,    "skipped" : 0,    "failed" : 0  },  "hits" : {    "total" : 1,    "max_score" : 0.2876821,    "hits" : [      {        "_index" : "my_index",        "_type" : "person",        "_id" : "5tQDEWgBrKRHlz9qAve8",        "_score" : 0.2876821,        "_source" : {          "lastName" : "foo",          "address" : { "street" : "bar"          }        }      }    ]  }}

copy_to

_source