OptionaladdOptionaldiscardDiscard invalid embedded documents from the source.
Not to be confused with dropInvalidEmbedded, which
does not discard the invalid embedded documents but
just prevents the document from being considered invalid
and drops invalid embedded documents during preparation.
Default: false.
OptionalkeepKeep the same ID of the original document. Default: false.
OptionalsaveSave the clone to the World database? Default: false.
Track the clone source. Default:
false.