Group by使用pymongo只返回mongodb中第一个匹配的文档，如何检索所有匹配的文档？

from pymongo import MongoClient

# 连接到MongoDB
client = MongoClient('mongodb://localhost:27017/')
db = client['your_database']
collection = db['your_collection']

# 构建聚合管道
pipeline = [
    {
        '$group': {
            '_id': '$your_group_field',
            'documents': {'$push': '$$ROOT'}
        }
    }
]

# 执行聚合操作
result = collection.aggregate(pipeline)

# 遍历结果
for group in result:
    print(group['_id'])
    for document in group['documents']:
        print(document)