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我在弹性搜索中有一个动态映射的索引。其中一个字段lastUpdated是一个纪元时间，它被检测为long。如何确保将其作为date类型拾取。有没有办法修改现有索引中的一个字段（类型从 long 到 date 更改）？
lastUpdated
long
date