milvus: [Bug]: [chaos][querynode]Search hangs after deleting querynode pod failure chaos

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version:`0f2b7d1`
- Deployment mode(standalone or cluster): cluster with 2 querynode
- SDK version(e.g. pymilvus v2.0.0rc2):2.0.0rc9.dev13
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

after delete chaos, search hangs

Expected Behavior

all operations works well

Steps To Reproduce

cd `tests/python_client/chaos`

modify params:
pod="querynode"
chaos_type="pod_failure"
chaos_task="chaos-test"

run script `bash chaos_test.sh`

Anything else?

before injecting chaos, collection hello_milvus was not released querynode-pod-failure-11-22-20-54-00.zip