Interface UpdateDescription<TSchema>

A document containing additional information about any ambiguous update paths from the update event. 包含有关更新事件中任何不明确更新路径的附加信息的文档。The document maps the full ambiguous update path to an array containing the actual resolved components of the path. 文档将完全不明确的更新路径映射到包含路径的实际解析组件的数组。For example, given a document shaped like { a: { '0': 0 } }, and an update of { $inc: 'a.0' }, disambiguated paths would look like the following:例如，给定形状为{ a: { '0': 0 } }的文档和{ $inc: 'a.0' }的更新，消除歧义的路径如下所示：

An array of field names that were removed from the document.从文档中删除的字段名数组。

An array of documents which record array truncations performed with pipeline-based updates using one or more of the following stages:一个文档数组，用于记录使用以下一个或多个阶段执行的基于管道的更新的数组截断：

• $addFields
• $set
• $replaceRoot
• $replaceWith

A document containing key:value pairs of names of the fields that were changed, and the new value for those fields.包含已更改字段名称的键：值对以及这些字段的新值的文档。