原英文版地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/mapping-field-meta.html, 原文档版权归 www.elastic.co 所有
本地英文版地址: ../en/mapping-field-meta.html
重要: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 当前版本文档。
Elasticsearch Guide [7.7] » Mapping » Mapping parameters » meta
« index_prefixes fields »

metaedit

Metadata attached to the field. This metadata is opaque to Elasticsearch, it is only useful for multiple applications that work on the same indices to share meta information about fields such as units

PUT my_index
{
  "mappings": {
    "properties": {
      "latency": {
        "type": "long",
        "meta": {
          "unit": "ms"
        }
      }
    }
  }
}

Field metadata enforces at most 5 entries, that keys have a length that is less than or equal to 20, and that values are strings whose length is less than or equal to 50.

Field metadata is updatable by submitting a mapping update. The metadata of the update will override the metadata of the existing field.

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