[Bug]: create index on json field is not supported: expected=supported field, actual=create index on 104 field: invalid parameter

[Joyce920hope]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I'm following this example https://github.com/milvus-io/pymilvus/blob/master/examples/sparse.py to store sparse embedding in Milvus server.

I got this error when I created an index on collection:
client.create_collection('my_sparse_collection', schema=schema,
index_params=index_params, timeout=5, consistency_level="Strong")

error:
RPC error: [create_index], <MilvusException: (code=1100, message=create index on json field is not supported: expected=supported field, actual=create index on 104 field: invalid parameter)>, <Time:{'RPC start': '2024-12-04 11:47:50.713235', 'RPC error': '2024-12-04 11:47:50.793430'}>
Failed to create an index on collection: my_sparse_collection

Expected Behavior

The index can be created on sparse vector field.

Steps/Code To Reproduce behavior

uri = f"http://{MILVUS_HOST}:{MILVUS_PORT}"
    
client = MilvusClient(
    uri=uri,
    user = MILVUS_USER,
    password = MILVUS_PASSWORD,
    db_name = "default",
)


fields = [
    FieldSchema(name="pk", dtype=DataType.VARCHAR,
                is_primary=True, auto_id=True, max_length=100),
    FieldSchema(name="random", dtype=DataType.DOUBLE),
    FieldSchema(name="sparse_vector", dtype=DataType.SPARSE_FLOAT_VECTOR),
]
schema = CollectionSchema(
    fields, "demo for using sparse float vector with milvus client")

index_params = client.prepare_index_params()
index_params.add_index(field_name="sparse_vector", index_name="sparse_inverted_index",
                       index_type="SPARSE_INVERTED_INDEX", metric_type="IP", params={"drop_ratio_build": 0.2})
client.create_collection('my_sparse_collection', schema=schema,
                                index_params=index_params, timeout=5, consistency_level="Strong")

Environment details

Milvus version: 2.2.8
pymilvus version: 2.5.0

Anything else?

No response