[Bug]: Cannot create SCANN index with with_raw_data=False

[smdsbz]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When I create SCANN index with with_raw_data=False via pymilvus, the index parameter is wiped. However, I am able to properly create the index with Attu.

The steps to reproduce is shown as below:

Milvus cluster: reproduced on 2.5.12 and above
pymilvus: 2.6.5
Attu: 2.5.5

Expected Behavior

Able to properly initialize the SCANN index params just as shown in the docs:

Steps/Code To Reproduce behavior

See `Describe the bug`

Environment details

- Hardware/Softward conditions (OS, CPU, GPU, Memory):
- Method of installation (Docker, or from source):
- Milvus version (v0.3.1, or v0.4.0): reproduced on 2.5.12 and above
- Milvus configuration (Settings you made in `server_config.yaml`):

- pymilvus version: 2.6.5 via `pip install`
- Attu version: 2.5.5

Anything else?

No response

[XuanYang-cn]

/assign @jac0626
PTAL

[liliu-z]

/assign @chasingegg

[FeilongHou]

This issue is currently blocking e2e test cases. More specifically on tests/python_client/milvus_client/test_milvus_client_alter.py::TestMilvusClientAlterIndex::test_milvus_client_alter_index_default

The current behavior is showing a lower case 'true' instead of an upper case 'True'
This pymilvus bug exists in 2.7.0rc96 and 2.6.6rc12.
Pymilvus version earlier than these are ok.

[XuanYang-cn]

@FeilongHou Help verify plz