Which pipeline can produce this JSON document in output?

{"_id" : "movie", "res" : 25}

Question

Which pipeline can produce this JSON document in output?
 
 {"_id" : "movie", "res" : 25}

Answer

db.mycollection.aggregate([ {$group : {"_id" : "$movie", "val" : {$sum : 1}}} ])

Answer

db.mycollection.aggregate([ {$group : {"_id" : "movie", "res" : {$sum : 1}}} ])

Answer

db.mycollection.aggregate([ {$group : {"_id" : "movie", "val" : {$sum : 1}}} ])

Answer

db.mycollection.aggregate([ {$group : {"_id" : "$movie", "res" : {$sum : 1}}} ])

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