[Bug]: MilvusClient isn't setting nlist while creating IVF_FLAT IP index about pymilvus HOT 4 OPEN

import time
import numpy as np

import time

import numpy as np
from pymilvus import (
    connections,
    utility,
    FieldSchema, CollectionSchema, DataType,
    MilvusClient,
)

dim = 8
collection_name = "hello_milvus"
milvus_client = MilvusClient("http://localhost:19530")

fields = [
    FieldSchema(
        name="pk",
        dtype=DataType.VARCHAR,
        max_length=50,
        is_primary=True,
        auto_id=False,
    ),
    FieldSchema(name="bool", dtype=DataType.BOOL),
    FieldSchema(name="codes", dtype=DataType.JSON),
    FieldSchema(name="json", dtype=DataType.JSON),
    FieldSchema(name="embeddings", dtype=DataType.FLOAT_VECTOR, dim=dim),
]
schema = CollectionSchema(
    fields=fields, description="search recipes", enable_dynamic_field=True
)

index_params = milvus_client.prepare_index_params()
index_params.add_index(
    field_name="embeddings",
    index_type="IVF_FLAT",
    metric_type="IP",
    params={"nlist": 1536}
)

milvus_client.create_collection(
    collection_name,
    id_type="string",
    vector_field_name="embeddings",
    metric_type="IP",
    schema=schema,
    index_params=index_params
)

index_names = milvus_client.list_indexes(collection_name)
print(f"index names for {collection_name}:", index_names)
for index_name in index_names:
    index_info = milvus_client.describe_index(collection_name, index_name=index_name)
    print(f"index info for index {index_name} is:", index_info)

index names for hello_milvus: ['embeddings']
index info for index embeddings is: {'index_type': 'IVF_FLAT', 'metric_type': 'IP', 'nlist': '1536', 'field_name': 'embeddings', 'index_name': 'embeddings'}