[{"_id":ObjectId("5e3d09cc7f8bc30a75025035"),"name":[{"value":"abc","created_on":"2020-02-06 06:11:21.340611+00:00"},{"value":"xyz","created_on":"2020-02-07 06:11:21.340611+00:00"}],"score":[{"value":12,"created_on":"2020-02-06 06:11:21.340611+00:00"},{"value":13,"created_on":"2020-02-07 06:11:21.340611+00:00"}]},{"_id":ObjectId("5e3d09d37f8bc30a750250f7"),"name":[{"value":"abc1","created_on":"2020-02-06 06:11:21.340611+00:00"},{"value":"xyz1","created_on":"2020-02-07 06:11:21.340611+00:00"}],"score":[{"value":121,"created_on":"2020-02-06 06:11:21.340611+00:00"},{"value":131,"created_on":"2020-02-07 06:11:21.340611+00:00"}]}]

db.collection.aggregate([{$addFields:{name:{$arrayElemAt:["$name",-1]},score:{$arrayElemAt:["$score",-1]}}},{$addFields:{name:"$name.value",score:"$score.value"}}])