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    Type:Task 
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    Resolution: Won't Do
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    Priority:Major - P3 
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    Affects Version/s: None
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    Component/s: None
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        Storage Execution
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Replacement updates on clustered collections currently assume _id as the cluster key. Extend the logic to support arbitrary cluster keys.
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                    SERVER-60537 Support clustering by single-field arbitrary key for non-explicitly-replicated collections -         
- Closed
 
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                    SERVER-72490 Complete TODO listed in SERVER-60734 -         
- Closed
 
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