[{"item":[{"array_objects":[{"text":"","second_text":"","empty_array":[],"empty_array_2":[],}]}]},{"item":[{"array_objects":[{"text":"text","second_text":"second","empty_array":[],"empty_array_2":[],}]}]}]

db.collection.aggregate([{$unwind:"$item"},{$unwind:"$item.array_objects"},{$project:{item:{$arrayToObject:{$filter:{input:{$objectToArray:"$item.array_objects"},cond:{$and:[{$ne:["$$this.v",""]},{$ne:["$$this.v",[]]}]}}}}}}])