[{"_id":ObjectId("5fcc6b68cdf3991270faef0f"),"UsageCount":6000,"Name":"technology"},{"_id":ObjectId("5fc5cdb5d6ee08681d32d3ba"),"UsageCount":9000,"Name":"technology"},{"_id":ObjectId("5fc5cdb5d6ee08681d32d3b2"),"UsageCount":7000,"Name":"technology"},{"_id":ObjectId("5fc5cdb5d6ee08681d32d3b1"),"UsageCount":8000,"Name":"technology"}]

db.collection.aggregate([{$sort:{UsageCount:-1}},{$group:{_id:null,tags:{$push:"$$ROOT"}}},{$set:{tags:{$slice:["$tags",{$add:[{$indexOfArray:["$tags._id",ObjectId("5fc5cdb5d6ee08681d32d3b1")]},1]},{$size:"$tags"}]}}},{$unwind:"$tags"},{$replaceWith:"$tags"}])