{
            bsonType: "object",
            required: ["_id", "linkId", "body", "score","isRemoved"],
            comment: {
                _id: {
                    bsonType: "objectId",
                    description: "must be an objectId and is required"
                },
                linkId: {
                    bsonType: "objectId",
                    description: "must be an objectId and is required"
                },
                body{
                    bsonType: "string",
                    description: "must be a string and is required"
                },
                score{
                    bsonType: "int",
                    description: "must be an int and is required"
                },
                isRemoved{
                    bsonType: "boolean",
                    description: "must be an boolean and is required"
                }
            },
            user: {
                _id: {
                    bsonType: "objectId",
                    description: "must be an objectId and is required"
                },
                firstName: {
                    bsonType: "string",
                    description: "must be an string and is required"
                },
                lastName: {
                    bsonType: "string",
                    description: "must be an string and is required"
                },
                password: {
                    bsonType: "string",
                    description: "must be an string and is required"
                },
                activationToken: {
                    bsonType: "string",
                    description: "must be an string and is not required"
                },
                resetPasswordToken: {
                    bsonType: "string",
                    description: "must be an string and is not required"
                },
                linkSearchHistory: [
                    link:{
                        bsonType: "object",
                        description: "must be an object and is optional",
                        required: ["linkId", "searchDate, "minScore","ammount"],
                        properties: {
                                linkId:{
                                    bsonType: "objectId",
                                    description: "must be an objectId and is required"
                                },
                                searchDate:{
                                    bsonType: "date",
                                    description: "must be an objectId and is required"
                                },
                                threadTitle:{
                                    bsonType: "string",
                                    description: "must be an objectId and is not required"
                                },
                                minScore:{
                                    bsonType: "int",
                                    description: "must be an objectId and is required"
                                },
                                ammount:{
                                    bsonType: "int",
                                    description: "must be an objectId and is required"
                                }
                        }
                    }
                ]
            },
            sessions: {
                _id: {
                    bsonType: "objectId",
                    description: "must be an objectId and is required"
                },
                session_id: {
                    bsonType: "string",
                    description: "must be an string and is required"
                },
                session_attributes{
                    bsonType: "string",
                    description: "must be an string and is required"
                }
            }
        }
    }
}