[Bug]: query_iterator does not work as before

[ravi160822]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

seems something changed with the query_iterator in the new release,
now I don't get all the docs, it just returns me the first batch

Expected Behavior

expected I should get all the docs like it was working before the new release.

Steps/Code To Reproduce behavior

from pymilvus import connections, Collection​
​
connections.connect(​
    uri="http://localhost:19530",​
    token="root:Milvus"​
)​
​
collection = Collection("query_collection")​
​
iterator = collection.query_iterator(​
    batch_size=10,​
    expr="color like \"red%\"",​
    output_fields=["color"]​
)​
​
results = []​
​
while True:​
    result = iterator.next()​
    if not result:​
        iterator.close()​
        break​
​
    print(result)​
    results += result​

same snippet as in the docs

Environment details

- Hardware/Softward conditions (OS, CPU, GPU, Memory): 
- Method of installation (Docker, or from source): docker
- Milvus version (v0.3.1, or v0.4.0): 2.5.0
- Milvus configuration (Settings you made in `server_config.yaml`):

Anything else?

no