ElasticSearch 6，带有动态索引映射的copy_to [英] ElasticSearch 6, copy_to with dynamic index mappings

问题描述

也许我遗漏了一些简单的东西，但仍然找不到以下内容：

Maybe I'm missing something simple, but still could not figure out the following thing:

从ES 6.x开始， _all 字段已弃用，建议使用 copy_to 指令（ https://www.elastic.co/guide/en/elasticsearch/reference/current/copy-to.html ）。

As of ES 6.x the _all field is deprecated, and instead it's suggested to use the copy_to instruction (https://www.elastic.co/guide/en/elasticsearch/reference/current/copy-to.html).

但是，我的印象是，您需要明确指定要复制到自定义 _all 字段。但是，如果我使用动态映射，则我不事先知道字段，因此不能使用 copy_to ？

However, I got an impression that you need to explicitly specify the fields which you want to copy to the custom _all field. But if I use dynamic mappings, I don't know the fields in advance, and therefore cannot use copy_to?

可以通过什么方式告诉ES将所有遇到的字段复制到自定义 _all 字段中，以便我可以在所有字段中进行搜索？

Any way I can tell ES to copy all encountered fields to the custom _all field so that I can search across all fields?

预先感谢！

推荐答案

您可以使用动态模板。基本上创建一个索引，添加自定义 catch_all 字段，然后为所有字符串字段指定该特定属性。 （以前没有做过，但是我相信这是现在的唯一方法。由于当您放置动态模板时， catch_all 字段已经存在，因此不会匹配 catch_all -表示 catch_all 不会复制到自身，而是自己检查以确保。）

You could use Dynamic Templates. Basically create an index, add the custom catch_all field and then specify that particular property for all the fields that are strings. (Haven't done this before, but I believe this is the only way now. Since the field catch_all will be already present when you put the dynamic template, it will not match the catch_all - meaning that the catch_all will not copy to itself, but check it out yourself to make sure).

PUT my_index
{
  "mappings": {
    "_doc": {
      "dynamic_templates": [
        {
          "strings": {
            "match_mapping_type": "string",
            "mapping": {
              "type": "text",
              "copy_to": "catch_all"
            }
          }
        }
      ]
    }
  }
}

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