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elasticsearch - 使用俄语文本分析器搜索不起作用

问题描述

我有非常简单的 ElasticSearch 模型：

[ElasticsearchType(RelationName = "example")]
public class ElasticModel
{
    [Text(Name = "description", Analyzer = "Russian", Index = true, SearchAnalyzer = "Russian")]
    public string Description { get; set; }
}

然后我通过下一行初始化我的索引：

protected ICreateIndexRequest ConfigureIndex(CreateIndexDescriptor indexDescriptor,
            Func<IndexSettingsDescriptor, IPromise<IIndexSettings>> selectorOfIndexSettings)
        {
            ICreateIndexRequest returnValue;

            returnValue = indexDescriptor.Settings(selectorOfIndexSettings);
            return returnValue;
        }

    await _client.Indices.CreateAsync(completeIndexName, indexDescriptor => ConfigureIndex(indexDescriptor, selector));

然后我用下一个值初始化我的模型并尝试搜索：

var document = new ElasticModel()
                        {
                            Description = "В Москве все выходные будут дожди"
                        };

                        var responseDoc = await await _client.IndexAsync(new IndexRequest<T>(document, completeIndexName))

var responseSearch = await _client.SearchAsync<ElasticModel>(s => s.Index(completeIndexName)
                            .Query(q => q.QueryString(c => c
                                                            .Query("выходной")
                            )));

但结果是空的。当我向我的 Elasticsearch 服务器发出下一个请求时：

POST {{ElasticSearchAddress}}/_analyze
{
  "analyzer": "russian",
  "text": "В Москве все выходные будут дожди"
}

我看到了预期的结果：

{
    "tokens": [
        {
            "token": "москв",
            "start_offset": 2,
            "end_offset": 8,
            "type": "<ALPHANUM>",
            "position": 1
        },
        {
            "token": "выходн",
            "start_offset": 13,
            "end_offset": 21,
            "type": "<ALPHANUM>",
            "position": 3
        },
        {
            "token": "будут",
            "start_offset": 22,
            "end_offset": 27,
            "type": "<ALPHANUM>",
            "position": 4
        },
        {
            "token": "дожд",
            "start_offset": 28,
            "end_offset": 33,
            "type": "<ALPHANUM>",
            "position": 5
        }
    ]
}

谁能解释一下，为什么我从 C# 代码中的搜索不使用俄语分析器并且不返回我预期的结果？

更新：

向 /elastictest100/_search 请求正文：

{
  "query": {
    "multi_match" : {
      "query":    "выходные будут", 
      "fields": [ "description" ],
      "analyzer": "russian"
    }
  }
}

还给我：

{
    "took": 2,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 3,
            "relation": "eq"
        },
        "max_score": 0.13353139,
        "hits": [
            {
                "_index": "mediadev-elastictest100",
                "_type": "_doc",
                "_id": "G2FzRnMBhdWoY2X4fmQo",
                "_score": 0.13353139,
                "_source": {
                    "description": "В Москве все выходные будут дожди"
                }
            },
            {
                "_index": "mediadev-elastictest100",
                "_type": "_doc",
                "_id": "HGGLRnMBhdWoY2X4AGSV",
                "_score": 0.13353139,
                "_source": {
                    "description": "В Москве все выходные будут дожди"
                }
            },
            {
                "_index": "mediadev-elastictest100",
                "_type": "_doc",
                "_id": "HWGMRnMBhdWoY2X4tGSY",
                "_score": 0.13353139,
                "_source": {
                    "description": "В Москве все выходные будут дожди"
                }
            }
        ]
    }
}

与身体：

{
  "query": {
    "multi_match" : {
      "query":    "выходной будет", 
      "fields": [ "description" ],
      "analyzer": "russian"
    }
  }
}

还给我：

{
    "took": 1,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 0,
            "relation": "eq"
        },
        "max_score": null,
        "hits": []
    }
}

标签： elasticsearchnestelasticsearch-net

解决方案

我不熟悉 Nest 代码，但可以为您提供一些调试问题的指示。

  1. 尝试打印最终搜索查询的 JSON，以便您可以使用 REST 搜索端点轻松对其进行测试，以比较您是否生成了正确的查询。
  2. 匹配查询使用与索引时间相同的分析器，但未分析术语查询，这会导致此类问题，并且最终要获得搜索结果，它应该将索引时间标记与搜索时间标记相匹配。

最容易检查搜索 JSON 并使用 ES REST 端点直接打击您的索引以查看根本原因。

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