reactivemongo.api.commands.AggregationFramework
(metadataKeyword: StringAdd).self
(metadataKeyword: StringFormat).self
(metadataKeyword: ArrowAssoc[MetadataKeyword]).x
(Since version 2.10.0) Use leftOfArrow
instead
(metadataKeyword: Ensuring[MetadataKeyword]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Keyword of metadata.