> db.myagg.aggregate( [{ $sort: { a: 1 } }] )
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{ "_id" : ObjectId("53ffb7c1c3ba2220c65af766"), "a" : 10 }
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{ "_id" : ObjectId("53ffb7c4c3ba2220c65af767"), "a" : 20 }
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{ "_id" : ObjectId("53ffb7c8c3ba2220c65af768"), "a" : 100 }
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{ "_id" : ObjectId("53ffb7cac3ba2220c65af769"), "a" : 1000 }
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> db.myagg.aggregate( [ { $sort: { a: -1 } } ] )
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{ "_id" : ObjectId("53ffb7cac3ba2220c65af769"), "a" : 1000 }
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{ "_id" : ObjectId("53ffb7c8c3ba2220c65af768"), "a" : 100 }
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{ "_id" : ObjectId("53ffb7c4c3ba2220c65af767"), "a" : 20 }
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{ "_id" : ObjectId("53ffb7c1c3ba2220c65af766"), "a" : 10 }
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