keyword §

ES字段类型，用于存储结构化内容，通过用于term查询以及排序，聚合操作。

Keyword fields are not normalized, as the normalizer property on the keyword type is set to null. But we can customize and enable normalizer on the keyword data type by setting filtes such as german_normalizer, uppercase , and so on.

keyword字段不会对字段值进行默认分词。

每个text字段会默认添加一个keyword的字段。