[{"_id":{"teamName":"BILALATI6449","tournamentId":"197831"},"players":[{"_id":"113069","points":155},{"_id":"249044","points":0},{"_id":"113129","points":0},{"_id":"196713","points":0},{"_id":"181056","points":0},{"_id":"2331078","points":0},{"_id":"7486355","points":0},{"_id":"113036","points":0},{"_id":"249047","points":0},{"_id":"658022","points":0},{"_id":"182623","points":0}],"totalTeamPoints":0,"__v":0}]

db.collection.update({"_id.teamName":"BILALATI6449"},[{$set:{totalTeamPoints:{$sum:"$players.points"}}},],{multi:true,new:true})