Question

使用Java api从弹性搜索中获取文档时，我的弹性搜索文档中包含以下code，并尝试使用以下模式进行搜索。

code : MS-VMA1615-0D

Input : *VMA1615-0*     -- Am getting the results (MS-VMA1615-0D).
Input : MS-VMA1615-0D   -- Am getting the results (MS-VMA1615-0D).
Input : *VMA1615-0      -- Am getting the results (MS-VMA1615-0D).
Input : *VMA*-0*        -- Am getting the results (MS-VMA1615-0D).

但是，如果我像下面这样输入，就不会得到结果。

Input : VMA1615         -- Am not getting the results.

有人希望返回代码MS-VMA1615-0D

请找到我下面正在使用的Java代码

private final String INDEX = "products";
private final String TYPE = "doc";
SearchRequest searchRequest = new SearchRequest(INDEX); 
    searchRequest.types(TYPE);
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    QueryStringQueryBuilder qsQueryBuilder = new QueryStringQueryBuilder(code); 

    qsQueryBuilder.defaultField("code");
    searchSourceBuilder.query(qsQueryBuilder);

    searchSourceBuilder.size(50);
    searchRequest.source(searchSourceBuilder);
    SearchResponse searchResponse = null;
    try {
         searchResponse = SearchEngineClient.getInstance().search(searchRequest);
    } catch (IOException e) {
        e.getLocalizedMessage();
    }
    Item item = null;
    SearchHit[] searchHits = searchResponse.getHits().getHits();

请找到我的地图详细信息：

PUT products
{
"settings": {
"analysis": {
  "analyzer": {
    "custom_analyzer": {
      "type": "custom",
      "tokenizer": "whitespace",
      "char_filter": [
        "html_strip"
      ],
      "filter": [
        "lowercase",
        "asciifolding"
      ]
    }
   }
  }
},
"mappings": {
"doc": {
  "properties": {
    "code": {
      "type": "text",
       "analyzer": "custom_analyzer"
      }
       }
  }
 }
}

Answer 1

要执行所需的操作，可能必须更改所使用的令牌生成器。当前，您正在使用空白标记生成器，该标记生成器必须替换为 pattern 标记生成器。因此，您的新映射应如下图所示：

PUT products
{
"settings": {
"analysis": {
  "analyzer": {
    "custom_analyzer": {
      "type": "custom",
      "tokenizer": "pattern",
      "char_filter": [
        "html_strip"
      ],
      "filter": [
        "lowercase",
        "asciifolding"
      ]
    }
   }
  }
},
"mappings": {
"doc": {
  "properties": {
    "code": {
      "type": "text",
       "analyzer": "custom_analyzer"
      }
    }
  }
 }
}

因此，更改映射后，对 VMA1615 的查询将返回 MS-VMA1615-0D 。

这可以将字符串“ MS-VMA1615-0D”标记为“ MS”，“ VMA1615”和“ 0D”。因此，只要您的查询中有任何一个，它将为您提供结果。

POST _analyze
{
  "tokenizer": "pattern",
  "text": "MS-VMA1615-0D"
}

将返回：

{
  "tokens": [
    {
      "token": "MS",
      "start_offset": 0,
      "end_offset": 2,
      "type": "word",
      "position": 0
    },
    {
      "token": "VMA1615",
      "start_offset": 3,
      "end_offset": 10,
      "type": "word",
      "position": 1
    },
    {
      "token": "0D",
      "start_offset": 11,
      "end_offset": 13,
      "type": "word",
      "position": 2
    }
  ]
}

基于您的评论：

弹性搜索不是这样工作的。 Elasticsearch存储条款和倒排索引数据结构中的相应文档，以及默认情况下，全文搜索产生的术语基于空格，即文本“嗨，我是技术专家”会拆分如[“ Hi”，“ there”，“ I”，“ am”，“ a”，“ technocrat”）。所以这意味着存储的术语取决于标记的方式。后查询时建立索引让我们在上面的示例中进行查询 “技术专家”，我会得到结果，因为倒排索引有与我的文档相关的术语。因此，在您的情况下，“ VMA”不存储为术语。

为此，请使用以下映射：

PUT products
{
"settings": {
"analysis": {
  "analyzer": {
    "custom_analyzer": {
      "type": "custom",
      "tokenizer": "my_pattern_tokenizer",
      "char_filter": [
        "html_strip"
      ],
      "filter": [
        "lowercase",
        "asciifolding"
      ]
    }
   },
   "tokenizer": {
     "my_pattern_tokenizer": {
          "type": "pattern",
          "pattern": "-|\\d"
        }
   }
  }
},
"mappings": {
"doc": {
  "properties": {
    "code": {
      "type": "text",
       "analyzer": "custom_analyzer"
      }
    }
  }
 }
}

要检查：

POST products/_analyze
{
  "tokenizer": "my_pattern_tokenizer",
  "text": "MS-VMA1615-0D"
}

将产生：

{
  "tokens": [
    {
      "token": "MS",
      "start_offset": 0,
      "end_offset": 2,
      "type": "word",
      "position": 0
    },
    {
      "token": "VMA",
      "start_offset": 3,
      "end_offset": 6,
      "type": "word",
      "position": 1
    },
    {
      "token": "D",
      "start_offset": 12,
      "end_offset": 13,
      "type": "word",
      "position": 2
    }
  ]
}

ElasticSearch-输入查询中没有（*）时不会发生JavaApi搜索

1 个答案: