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Keyword datatype

用于索引结构化的数据的字段,比如 email 地址、主机名、状态码、邮政编码或者标签,通常用于过滤(查找所有状态是 published 的博客文章)、排序、聚合。keyword 字段只能通过精确值来搜索。

如果需要索引全文内容,比如 email 体或者产品描述,那么你可能需要使用 text 字段。

curl -XPUT 'localhost:9200/my_index?pretty' -d'
{
  "mappings": {
    "my_type": {
      "properties": {
        "tags": {
          "type":  "keyword"
        }
      }
    }
  }
}'

Parameters for keyword fields

keyword 字段接受的参数

boost

Mapping field-level query time boosting. Accepts a floating point number, defaults to 1.0.

doc_values

Should the field be stored on disk in a column-stride fashion, so that it can later be used for sorting, aggregations, or scripting? Accepts true(default) or false.

eager_global_ordinals

 Should global ordinals be loaded eagerly on refresh? Accepts true or false (default). Enabling this is a good idea on fields that are frequently used for terms aggregations.
fields

Multi-fields allow the same string value to be indexed in multiple ways for different purposes, such as one field for search and a multi-field for sorting and aggregations.

ignore_above

Do not index any string longer than this value. Defaults to 2147483647 so that all values would be accepted.

include_in_allWhether or not the field value should be included in the _all field? Accepts true or false. Defaults to false if index is set to no, or if a parent object field sets include_in_all to false. Otherwise defaults to true.
index

Should the field be searchable? Accepts true (default) or false.

index_optionsWhat information should be stored in the index, for scoring purposes. Defaults to docs but can also be set to freqs to take term frequency into account when computing scores.
normsWhether field-length should be taken into account when scoring queries. Accepts true or false (default).
null_valueAccepts a string value which is substituted for any explicit null values. Defaults to null, which means the field is treated as missing.
store

Whether the field value should be stored and retrievable separately from the _source field. Accepts true or false (default).

similarity

Which scoring algorithm or similarity should be used. Defaults to BM25.

normalizer

[experimental This functionality is experimental and may be changed or removed completely in a future release. Elastic will take a best effort approach to fix any issues, but experimental features are not subject to the support SLA of official GA features.How to pre-process the keyword prior to indexing. Defaults to null, meaning the keyword is kept as-is.

注意

2.x版本导入的索引不支持 keyword 。它们会尝试将 keyword 降级到 string 。这允许你将新映射和旧映射合并。长期索引在升级到6.x之前必须重新创建,但是映射降级允许你根据自己的安排来进行重新创建。

 

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