elasticsearch - 使用elasticsearch对完整字符串进行排序

Question

我正在尝试使用Elasticsearch对以下项目进行排序

[
    {name: 'Company 1'},
    {name: 'Company 2'},
    {name: 'aa 01'},
    {name: 'aabb'}
]

如果我按名称进行排序(-> ...是ES的排序部分)

aa 01 -> 01
Company 1 -> 1
Company 2 -> 2
aabb -> aabb

我想拥有

aa 01
aabb
Company 1
Company 2

我试图用type: 'keyword'更改映射(-> ...是ES的排序部分)

Company 1 -> Company 1
Company 2 -> Company 2
aa 01 -> aa 01
aabb -> aabb

我试图找到其他警告语，但它似乎是旧的ES版本，例如Elastic search alphabetical sorting based on first character，index_analyzer或index均不起作用

Answer 1

您将按字典顺序获得结果，这对于计算机而言是完全合适的，但对人类来说却没有太大意义(期望结果按字母顺序排序)。

用于表示大写字母的字节的值比用于表示小写字母的字节的值低，因此名称以最低的字节排在最前面。 ASCII Table

为此，您需要以字节顺序对应于所需排序顺序的方式为每个名称建立索引。换句话说，您需要一个将发出单个小写 token 的分析器。

为要排序的字段创建自定义关键字分析器:

PUT /my_index
{
  "settings" : {
    "analysis" : {
      "analyzer" : {
        "custom_keyword_analyzer" : {
          "tokenizer" : "keyword",
          "filter" : ["lowercase"]
        }
      }
    }
  },
  "mappings" : {
    "_doc" : {
      "properties" : {
        "name" : {
          "type" : "text",
          "fields" : {
            "raw" : {
              "type" : "text",
              "analyzer" : "custom_keyword_analyzer",
              "fielddata": true
            }
          }
        }
      }
    }
  }
}

索引您的数据:

POST my_index/_doc/1
{
  "name" : "Company 01"
}

POST my_index/_doc/2
{
  "name" : "Company 02"
}

POST my_index/_doc/3
{
  "name" : "aa 01"
}

POST my_index/_doc/4
{
  "name" : "aabb"
}

执行排序:

POST /my_index/_doc/_search
{
  "sort": "name.raw"
}

响应:

[
    {
        "_index": "my_index",
        "_type": "_doc",
        "_id": "3",
        "_score": null,
        "_source": {
            "name": "aa 01"
        },
        "sort": [
            "aa 01"
        ]
    },
    {
        "_index": "my_index",
        "_type": "_doc",
        "_id": "4",
        "_score": null,
        "_source": {
            "name": "aabb"
        },
        "sort": [
            "aabb"
        ]
    },
    {
        "_index": "my_index",
        "_type": "_doc",
        "_id": "1",
        "_score": null,
        "_source": {
            "name": "Company 01"
        },
        "sort": [
            "company 01"
        ]
    },
    {
        "_index": "my_index",
        "_type": "_doc",
        "_id": "2",
        "_score": null,
        "_source": {
            "name": "Company 02"
        },
        "sort": [
            "company 02"
        ]
    }
] 

引用:Sorting and Collations