c# - ElasticSearch中的单词匹配

Question

这就是我映射索引的方式。

 settings = new ConnectionSettings(pool)
              .DefaultIndex(defaultIndex)
              .MapDefaultTypeNames(m => m.Add(typeof(MyClass), "content"))
              .PrettyJson()
              .DisableDirectStreaming());

可以说我有一个文档索引到ES

content: "Tim Cook revealed during the earnings call that iPhone sales in India grew by 56% on a yearly basis, despite the company's first global sales decline in 13 years."

现在，如果用户使用匹配查询搜索单词

{
  "query": {
    "match": {
      "answer": {
        "query": "decline"
      }
    }
}}

说我得到0.047分。

但是，使用相同的查询，如果我搜索单词“下降” ，则得到0分。我想检查该单词是否部分存在于文档中。我怎样才能做到这一点？

Answer 1

您需要通过声明一个特定的分析器来分析内容字段来定义字段映射。在这种情况下，我们可以使用 english language analyzer，它将根据英语语法和词汇规则来阻止标记。

PUT your_index
{
  "mappings": {
    "your_type": {
      "properties": {
        "content": {
          "type": "string",
          "analyzer": "english"
        }
      }
    }
  }
}

然后您可以索引您的内容

PUT /your_index/your_type/1
{
  "content": "Tim Cook revealed during the earnings call that iPhone sales in India grew by 56% on a yearly basis, despite the company's first global sales decline in 13 years."
}

最后，您可以同时搜索decline和declining并获得相同的分数

POST /your_index/_search 
{
  "query": {
    "match": {
      "content": {
        "query": "decline"
      }
    }
  }
}

POST /your_index/_search 
{
  "query": {
    "match": {
      "content": {
        "query": "declining"
      }
    }
  }
}