[{"_id":ObjectId("5eae60e4055ef0e717f06a50"),"registered_data":ISODate("2020-05-03T16:12:51.999Z"),"UniqueName":"SomeUniqueNameHere","keywords":[{"sfr":NumberInt(20127)},{"sfr":NumberInt(35970)},{"sfr":NumberInt(37546)},{"sfr":NumberInt(48213)},{"sfr":NumberInt(223665)},{"sfr":NumberInt(87452)},{"sfr":NumberInt(56321)},{"sfr":NumberInt(33265)},{"sfr":NumberInt(44521)},{"sfr":NumberInt(98665)},{"sfr":NumberInt(1135675)},{"sfr":NumberInt(85642)},{"sfr":NumberInt(89532)}]},{"_id":ObjectId("5eae60e4055ef0e717f06a51"),"registered_data":ISODate("2020-05-03T16:12:51.999Z"),"UniqueName":"SomeUniqueNameHere","keywords":[{"sfr":NumberInt(2154)},{"sfr":NumberInt(62351242)},{"sfr":NumberInt(6985332)},{"sfr":NumberInt(48752)},{"sfr":NumberInt(365215)},{"sfr":NumberInt(8554)},{"sfr":NumberInt(84632)},{"sfr":NumberInt(22258)},{"sfr":NumberInt(112565)},{"sfr":NumberInt(33265)},{"sfr":NumberInt(66548)},{"sfr":NumberInt(174582)},{"sfr":NumberInt(953353)}]},{"_id":ObjectId("5eae60e4055ef0e717f06a52"),"registered_data":ISODate("2020-05-03T16:12:51.999Z"),"UniqueName":"SomeUniqueNameHere","keywords":[{"sfr":NumberInt(52485)},{"sfr":NumberInt(1052)},{"sfr":NumberInt(332)},{"sfr":NumberInt(45214)},{"sfr":NumberInt(85421)},{"sfr":NumberInt(32654)},{"sfr":NumberInt(1002)},{"sfr":NumberInt(1205)},{"sfr":NumberInt(32652)},{"sfr":NumberInt(41521)},{"sfr":NumberInt(25412132)},{"sfr":NumberInt(6532)},{"sfr":NumberInt(84521)}]}]

db.collection.aggregate([{$project:{registered_data:1,UniqueName:1,keywords:{$filter:{input:"$keywords",as:"item",cond:{$lte:["$$item.sfr",100000]}}}}},{$project:{registered_data:1,UniqueName:1,keywords:1,keywordsLength:{$size:"$keywords"}}},{$match:{keywordsLength:{$gte:9}}}])