使用 NEST 将 List<object> 插入 Elasticsearch

Question

我有很多在运行时生成的不同值集合，想将它们发送到 ElasticSearch。我可以将它们表示为 List<object>，或者如果确实无法以任何其他方式工作，则表示为 List<string>。但我找不到任何例子如何做到这一点。这是不起作用的代码示例。它可能有很多错误，因此非常感谢任何额外的指示。

  var client = new ElasticClient(new Uri("http://localhost:9200"));
            client.CreateIndex("testentry");
            var values = new List<object> {"StringValue", 123, DateTime.Now};
            var indexResponse = client.Index(values, descriptor => descriptor.Index("testentry"));
            Console.WriteLine(indexResponse.DebugInformation);

这导致：

Invalid NEST response built from a unsuccessful low level call on POST: /testentry/list%601
# Audit trail of this API call:
 - [1] BadResponse: Node: http://localhost:9200/ Took: 00:00:00.0600035
# ServerError: ServerError: 400Type: mapper_parsing_exception Reason: "failed to parse" CausedBy: "Type: not_x_content_exception Reason: "Compressor detection can only be called on some xcontent bytes or compressed xcontent bytes""

和

[2016-09-17 14:16:20,955][DEBUG][action.index             ] [Gin Genie] failed to execute [index {[t
estentry][list`1][AVc4E3HaPglqpoLcosDo], source[_na_]}] on [[testentry][1]]
MapperParsingException[failed to parse]; nested: NotXContentException[Compressor detection can only
be called on some xcontent bytes or compressed xcontent bytes];
        at org.elasticsearch.index.mapper.DocumentParser.parseDocument(DocumentParser.java:156)

我正在使用 Elasticsearch.Net 2.4.3 和 NEST 2.4.3。

Answer 1

Arrays 不支持混合数据类型。

您可以将所有值转换为字符串：

client.CreateIndex("testentry");
var values = new List<string> { "StringValue", "123", DateTime.Now.ToString() };
var indexResponse = client.Index(new { Values = values}, descriptor => descriptor.Index("testentry").Type("test"));

或指定值应索引到的字段：

client.CreateIndex("testentry");
var values = new { Field1 = "StringValue", Field2 = 123, Field3 = DateTime.Now };
var indexResponse = client.Index(values, descriptor => descriptor.Index("testentry").Type("test"));

考虑使用 IndexDescriptor 指定文档类型或为文档创建 class。

Answer 2

，您还可以在 Dictionary<string, object>

中索引值

public class MyType
{
    public MyType()
    {
        Values = new Dictionary<string, object>();
    }

    public Dictionary<string, object> Values { get; private set; }
}

void Main()
{
    var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));
    var connectionSettings = new ConnectionSettings(pool);

    var client = new ElasticClient(connectionSettings);

    var myType = new MyType
    {
        Values =
        {
            { "value1", "StringValue" },
            { "value2", 123 },
            { "value3", DateTime.Now },
        }
    };

    client.Index(myType, i => i.Index("index-name"));
}

Dictionary<string,object> 将被序列化为具有属性名称的 json 对象以匹配字典键

{
  "values": {
    "value1": "StringValue",
    "value2": 123,
    "value3": "2016-09-18T18:41:48.7344837+10:00"
  }
}

在 Elasticsearch 中，映射将被推断为 object type。

使用 NEST 将 List<object> 插入 Elasticsearch

Insert List<object> into Elasticsearch with NEST

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