如何使用groovy从mongodb中提取_id字段中的完整值？

@Grab('org.mongodb:mongodb-driver-sync:4.4.3')
import com.mongodb.client.MongoClients
import org.bson.Document

def mongoClient = MongoClients.create("mongodb://localhost:27017")
def database = mongoClient.getDatabase("your_database_name")

def collection = database.getCollection("your_collection_name")

def cursor = collection.find()
while (cursor.hasNext()) {
    def document = cursor.next()
    def id = document.get("_id")
    println(id)
}