Ah, $documents is new in version 6.0 - are you using an older version? The same thing can be done without 6.0 by generating an array of dates with same $map+$range and then an $unwind…
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Ah, $documents is new in version 6.0 - are you using an older version? The same thing can be done without 6.0 by generating an array of dates with same $map+$range and then an $unwind…