检查全文字段是否有一个范围内的日期

Question

你好，我是弹性世界的新手，我想弄清楚如何找到一个字段，例如 "text"（代表索引的整个文本）是否有一个特定范围内的日期？

示例：在字段 "text" 的 doc_1 中，我们有 "I was born on 27/05/1995"，我想检查该文档中是否包含日期，该日期介于 20/05/1995 和 30/05/1995 之间。

如果这不可能，那么我如何在索引此文档时获取此日期“1995 年 5 月 27 日”并将其存储到新字段中？当我们谈论索引包含日期的文档时，你能给我一个关于最佳方法的提示吗？

谢谢

Answer 1

我认为您在这里有多种选择。要搜索日期范围内的文档，您必须从文本中解析日期并将它们索引为 elasticsearch 中的日期字段。您可以在将文档发送到 elasticsearch 之前在应用程序内部执行此操作，也可以查看摄取节点。摄取节点使您有机会在编制索引之前预处理文档。 https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html

只要您在 elasticsearch 中拥有带有单独日期字段的文档，您就可以使用范围查询进行搜索：https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-range-query.html

Answer 2

我在下面使用正则表达式来匹配文本中的特定日期。我要找的日期格式是"yyyy-mm-dd"，你可以在子句里面打乱span_multi，来寻找你需要的格式。你可以阅读 span here

映射

PUT testindex
{
  "mappings": {
    "properties": {
      "content":{
        "type": "text"
      }
    }
  }
}

数据：

[
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "a3PLFW0BY3127H1HVxyC",
        "_score" : 1.0,
        "_source" : {
          "content" : "I was born on 2019/09/01"
        }
      },
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "bXPLFW0BY3127H1HaBwp",
        "_score" : 1.0,
        "_source" : {
          "content" : "I was born on 2019/09/15"
        }
      },
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "w3PLFW0BY3127H1HeBzg",
        "_score" : 1.0,
        "_source" : {
          "content" : "I was born on 2019/09/20"
        }
      }
    ]

查询：

GET testindex/_search
{
  "query": {
    "span_near": {
      "clauses": [
        {
----> clauses below look for year,month,date, you can change their order for desired
---->format
          "span_multi": {
            "match": {
              "regexp": {
                "content": "(19|20)[0-9]{2}"
              }
            }
          }
        },
        {
          "span_multi": {
            "match": {
              "regexp": {
                "content": "0[1-9]|1[012]"
              }
            }
          }
        },
         {
          "span_multi": {
            "match": {
              "regexp": {
                "content": "1[5-9]|[2][0]"  --> regex for date from 15-20
              }
            }
          }
        }
      ],
      "slop": 0,
      "in_order": true
    }
  }
}

结果

 [
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "bXPLFW0BY3127H1HaBwp",
        "_score" : 3.2095504,
        "_source" : {
          "content" : "I was born on 2019/09/15"
        }
      },
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "w3PLFW0BY3127H1HeBzg",
        "_score" : 3.2095504,
        "_source" : {
          "content" : "I was born on 2019/09/20"
        }
      }
    ]

检查全文字段是否有一个范围内的日期

Check if full text field has a date in a range

elasticsearch

nest