collection1.aggregate([
        {
            "$match": {
                "_id": f"{_id}"
            }
        },
        {
            "$graphLookup": {
                "from": "DocumentBases",
                "startWith": "$_id",
                'connectFromField': "_id",
                "connectToField": "parent_id",
                "maxDepth": 0,
                "depthField": "id",

                "as": "Children"
            }
        },
        {
            "$unwind": "$Children"
        },
        {
            "$sort": {
                "Children.id": 1
            }
        },
        {
            "$group": {
                "_id": "$_id",
                "Children": {"$push": "$Children._id"}
            }
        }
    ])