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    Type:Improvement 
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    Resolution: Duplicate
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    Priority:Minor - P4 
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    Affects Version/s: None
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    Component/s: Aggregation Framework
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would it be possible/useful to allow an upsert option to the $out directive?
something similar to mongoimport --upsertFields
- duplicates
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                    SERVER-12280 allow $out to append to/merge with existing collection instead of replacing it -         
- Closed
 
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