$sort should be pushed before $lookup if we are sorting on the "left" collection:
E.g.
db.foo.aggregate([
{$lookup: {from: "new", localField: "_id", foreignField: "_id", as: "list"}},
{$sort: {b:1}}
])
- is related to
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SERVER-26442 Push $sort before $project and $addFields
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- Open
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- related to
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