```http
PUT /collections/{collection_name}/points
{
    "points": [
        {
            "id": 1,
            "payload": {"group_id": "user_1"},
            "vector": [0.9, 0.1, 0.1]
        }
    ],
    "shard_key": {
        "fallback": "default",
        "target": "user_1"
    }
}
```