[Bug]: Search/Query may failed during updating delegator cache

[weiliu1031]

Is there an existing issue for this?

• [X] I have searched the existing issues

Environment

- Milvus version:master and 2.4
- Deployment mode(standalone or cluster):
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2):
- OS(Ubuntu or CentOS): 
- CPU/Memory: 
- GPU: 
- Others:

Current Behavior

proxy will update shard leader cache first, then release the lock and try to init shard client. which cause a period that user can get shard leader from meta cache, but can't find shard client from shard client manager

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[weiliu1031]

/assign