动态模板是否支持默认类型? [英] Dynamic templates support default types?

问题描述

动态模板允许您基于以下条件定义可应用于动态添加的字段的自定义映射:

Dynamic templates allow you to define custom mappings that can be applied to dynamically added fields based on:

• Elasticsearch检测到的数据类型，具有match_mapping_type.
• 具有匹配和不匹配或match_pattern的字段名称.
• 该字段的完整虚线路径，具有path_match和path_unmatch.

我试图为所有字段使用默认类型 keyword ，而某些具有特定 * Suffix 或 prefix * 的特殊字段可能已指定的类型如下，但最终所有字段意外地都是 keyword .

I was trying to have a default type keyword for all fields while some special fields with specific *Suffix or prefix* could have specified types as follows, but it turned out all fields will be keyword in the end unexpectedly.

{
  "order": 99,
  "index_patterns": [
    "xxxx_stats_*"
  ],
  "settings": {
    "index": {
      "number_of_shards": "6",
      "number_of_replicas": "1"
    }
  },
  "mappings": {
    "_doc": {
      "dynamic": true,
      "_source": {
        "enabled": true
      },
      "dynamic_templates": [
        {
          "strings": {
            "match_mapping_type": "*",
            "unmatch": [
              "*Time",
              "*At",
              "is*"
            ],
            "mapping": {
              "ignore_above": 256,
              "null_value": "NULL",
              "type": "keyword"
            }
          }
        },
        {
          "timeSuffix": {
            "match_mapping_type": "*",
            "match": [
              "*Time",
              "*At"
            ],
            "mapping": {
              "type": "long"
            }
          }
        },
        {
          "isPrefix": {
            "match_mapping_type": "*",
            "match": "is*",
            "mapping": {
              "type": "boolean"
            }
          }
        }
      ],
      "date_detection": false,
      "numeric_detection": true
    }
  },
  "aliases": {
    "{index}-alias": {
      
    }
  }
}

推荐答案

AFAIK match 和 unmatch 不能是数组，只能是字符串或正则表达式.所以试试这个:

AFAIK match and unmatch cannot be arrays, only strings or regexes. So try this:

{
  "dynamic_templates":[
    {
      "timeSuffix":{
        "match_mapping_type":"*",
        "match_pattern":"regex",
        "match":"^(.*Time)|(.*At)$",
        "mapping":{
          "type":"long"
        }
      }
    },
    {
      "isPrefix":{
        "match_mapping_type":"*",
        "match":"is*",
        "mapping":{
          "type":"boolean"
        }
      }
    },
    {
      "strings":{
        "match_mapping_type":"*",
        "mapping":{
          "ignore_above":256,
          "null_value":"NULL",
          "type":"keyword"
        }
      }
    }
  ]
}

我还发现，当您将 strings 移到底部时，上面的2个映射将首先得到解决.否则，由于每个段都包含 match_mapping_type:" *"，因此将应用第一个匹配段.此问题可能相关.

I also find that when you move strings to the bottom, the 2 mappings above will be resolved first. Otherwise, since every segment includes match_mapping_type":"*", the first matching segment will apply. This issue may be related.

这篇关于动态模板是否支持默认类型?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！