elasticsearch - 为什么不能在ElasticSearch 6.0中启用 “_all”字段？

Question

我有索引“index”并输入了“fulltext”，但是当我尝试通过https://www.elastic.co/guide/en/elasticsearch/reference/6.0/mapping-all-field.html建议启用“_all”字段时:

curl -XPUT 'localhost:9200/index?pretty' -H 'Content-Type: application/json' -d'
{
  "mapping": {
    "fulltext": {
      "_all": {
        "enabled": true   
      }
    }
  }
}
'

我收到的消息如下:

{
  "error" : {
    "root_cause" : [
      {
        "type" : "illegal_argument_exception",
        "reason" : "unknown setting [index.mapping.fulltext._all.enabled] please check that any required plugins are installed, or check the breaking changes documentation for removed settings"
      }
    ],
    "type" : "illegal_argument_exception",
    "reason" : "unknown setting [index.mapping.fulltext._all.enabled] please check that any required plugins are installed, or check the breaking changes documentation for removed settings"
  },
  "status" : 400
}

我该如何纠正？谢谢。

Answer 1

您无法在6.0中进行更改。
基本上，该字段不再存在，但是功能仍然存在，但是实现方式有所不同。因此，您不再需要关心它。

这就是您链接到的第一行文档所说的:

_all may no longer be enabled for indices created in 6.0+, use a custom field and the mapping copy_to parameter