使用NEST 2.x创建具有多字段映射语法的索引 [英] Create index with multi field mapping syntax with NEST 2.x

问题描述

在NEST 2.0中，我似乎无法获得语法正确的多字段映射 - 如果这是正确的术语。我找到的映射的每个例子似乎都是< = NEST的1.x版本。我是Elasticsearch和NEST的新手，我一直在阅读他们的文档，但是NEST文档还没有完全更新为2.x。

基本上，我不需要索引或存储整个类型。我需要索引的一些字段，我需要索引和检索的一些字段，一些我不需要索引，仅用于检索。

  MyType 
 {
 //索引此&允许检索。 
 int Id {get;组; } 
 
 //索引此&允许检索。 
 // **另外**，在我的搜索&排序，我需要排序这个**整个**字段，而不只是个别的标记。 
 string CompanyName {get;组; } 
 
 //不要为此搜索索引，但是要存储以进行显示。 
 DateTime CreatedDate {get;组; } 
 
 //索引此搜索，但不用于检索/显示。 
 string CompanyDescription {get;组; } 
 
 //嵌套这个。 
列表< MyChildType>地点{get;组; } 
} 
 
 MyChildType 
 {
 //索引此&允许检索。 
 string LocationName {get;组; } 
 
 //等属性。 
} 
  

我有有可以索引整个对象和子对象使用以下内容作为示例：

  client.Index（item，i =&i;指数（INDEXNAME））; 
  

然而，实际的对象比这个大得多，我真的不需要大部分它。我发现这个，看起来像我想要做的，但是在旧版本中：多现场映射弹性搜索

我认为映射是我要去的，但是像我说的那样，我刚刚到Elasticsearch，NEST和I '尝试学习术语。

要温柔！ :)这是我第一次提出一个关于SO的问题。谢谢！

解决方案

据我所见，你没有任何复杂的类型，你正在尝试地图。所以你可以轻松地使用NEST属性来映射你的对象。

查看这个：

 code> [Nest.ElasticsearchType] 
 public class MyType 
 {
 // Index this&允许检索。 
 [Nest.Number（Store = true）] 
 int Id {get;组; } 
 
 //索引此&允许检索。 
 // **另外**，在我的搜索&排序，我需要排序这个**整个**字段，而不只是个别的标记。 
 [Nest.String（Store = true，Index = Nest.FieldIndexOption.Analyzed，TermVector = Nest.TermVectorOption.WithPositionsOffsets）] 
 string CompanyName {get;组; } 
 
 //不要为此搜索索引，但是要存储以进行显示。 
 [Nest.Date（Store = true，Index = Nest.NonStringIndexOption.No）] 
 DateTime CreatedDate {get;组; } 
 
 //索引此搜索，但不用于检索/显示。 
 [Nest.String（Store = false，Index = Nest.FieldIndexOption.Analyzed）] 
 string CompanyDescription {get;组; } 
 
 [Nest.Nested（Store = true，IncludeInAll = true）] 
 //嵌套。 
列表< MyChildType>地点{get;组; } 
} 
 
 [Nest.ElasticsearchType] 
 public class MyChildType 
 {
 // Index this&允许检索。 
 [Nest.String（Store = true，Index = Nest.FieldIndexOption.Analyzed）] 
 string LocationName {get;组; } 
 
 //等属性。 
} 
  

在此声明之后，要在弹性搜索中创建此映射，您需要拨打电话类似于：

  var mappingResponse = elasticClient.Map< MyType>（m => m.AutoMap（））; 
  

使用AutoMap（）调用NEST将从您的POCO读取您的属性，并相应地创建一个映射请求。 / p>

另请参阅 here 。

干杯！

I just can't seem to get the syntax correct for multi field mapping in NEST 2.0--if that's the correct terminology. Every example I've found for mapping seems to be <= the 1.x version of NEST. I'm new to Elasticsearch and NEST, and I've been reading their documentation, but the NEST documentation hasn't been completely updated for 2.x.

Basically, I don't need to index or store the entire type. Some fields I need for indexing only, some fields I'll need to index and retrieve, and some I don't need for indexing, just for retrieval.

MyType
{
    // Index this & allow for retrieval.
    int Id { get; set; } 

    // Index this & allow for retrieval.
    // **Also**, in my searching & sorting, I need to sort on this **entire** field, not just individual tokens.
    string CompanyName { get; set; } 

    // Don't index this for searching, but do store for display.
    DateTime CreatedDate { get; set; }

    // Index this for searching BUT NOT for retrieval/displaying.
    string CompanyDescription { get; set; } 

    // Nest this.
    List<MyChildType> Locations { get; set; }
}

MyChildType
{
    // Index this & allow for retrieval.
    string LocationName { get; set; }

    // etc. other properties.
}

I've have been able to index the entire object and child as-is using the following as an example:

client.Index(item, i => i.Index(indexName));

However, the actual object is a lot larger than this, and I really don't need most of it. I've found this, which looks like what I think I want to do, but in an older version: multi field mapping elasticsearch

I think "mapping" is what I'm going for, but like I said, I'm new to Elasticsearch and NEST and I'm trying to learn the terminology.

Be gentle! :) It's my first time to ask a question on SO. Thanks!

解决方案

As far as I can see, you don't have any complex types that you are trying map. So you can easily use NEST attributes to map your objects.

Check this out:

[Nest.ElasticsearchType]
public class MyType
{
    // Index this & allow for retrieval.
    [Nest.Number(Store=true)]
    int Id { get; set; }

    // Index this & allow for retrieval.
    // **Also**, in my searching & sorting, I need to sort on this **entire** field, not just individual tokens.
    [Nest.String(Store = true, Index=Nest.FieldIndexOption.Analyzed, TermVector=Nest.TermVectorOption.WithPositionsOffsets)]
    string CompanyName { get; set; }

    // Don't index this for searching, but do store for display.
    [Nest.Date(Store=true, Index=Nest.NonStringIndexOption.No)]
    DateTime CreatedDate { get; set; }

    // Index this for searching BUT NOT for retrieval/displaying.
    [Nest.String(Store=false, Index=Nest.FieldIndexOption.Analyzed)]
    string CompanyDescription { get; set; }

    [Nest.Nested(Store=true, IncludeInAll=true)]
    // Nest this.
    List<MyChildType> Locations { get; set; }
}

[Nest.ElasticsearchType]
public class MyChildType
{
    // Index this & allow for retrieval.
    [Nest.String(Store=true, Index = Nest.FieldIndexOption.Analyzed)]
    string LocationName { get; set; }

    // etc. other properties.
}

After this declaration, to create this mapping in elasticsearch you need to make a call similar to:

var mappingResponse = elasticClient.Map<MyType>(m => m.AutoMap());

With AutoMap() call NEST will read your attributes from your POCO and create a mapping request accordingly.

Also see "Attribute Based Mapping" section from here.

Cheers!

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