db.getCollection('TestEmbedded').aggregate([
{ $unwind : "$instock" },{ $unwind :"$instock.detail"},{ $unwind :"$instock.detail.Number"},{ $match : {"instock.detail.Number.season":"2018-2019"}},{ $group : { _id : "$_id", item: {$first : "$item"}, instock:{$addToSet:"$instock"} }}])/* 1 */{ "_id" : ObjectId("5ae36897518f0371c0eacb98"), "item" : "postcard", "instock" : [ { "warehouse" : "C", "qty" : 35.0, "detail" : { "Variant" : "Muş", "Number" : { "enumber" : "E16", "season" : "2018-2019" } } } ]}
/* 2 */{ "_id" : ObjectId("5ae36897518f0371c0eacb96"), "item" : "paper", "instock" : [ { "warehouse" : "B", "qty" : 15.0, "detail" : { "Variant" : "Acı Çarliston", "Number" : { "enumber" : "E12", "season" : "2018-2019" } } } ]}
/* 3 */{ "_id" : ObjectId("5ae36897518f0371c0eacb97"), "item" : "planner", "instock" : [ { "warehouse" : "B", "qty" : 5.0, "detail" : { "Variant" : "AHK", "Number" : { "enumber" : "E13", "season" : "2018-2019" } } } ]}
/* 4 */{ "_id" : ObjectId("5ae3681962b244ff9756ddf3"), "item" : "journal", "instock" : [ { "warehouse" : "C", "qty" : 15, "detail" : { "Variant" : "Famela", "Number" : { "enumber" : "E30", "season" : "2018-2019" } } }, { "warehouse" : "A", "qty" : 5, "detail" : { "Variant" : "Chip", "Number" : { "enumber" : "E29-3", "season" : "2018-2019" } } }, { "warehouse" : "A", "qty" : 5, "detail" : { "Variant" : "Chip", "Number" : { "enumber" : "E29-2", "season" : "2018-2019" } } } ]}