[Bug]: restful bug

[smellthemoon]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version:
- 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

1. when autoid but still insert pk, pk will just be ingnored, not throw err.
2. query json data, user will see the byte, not json format.
3. if varchar type not set max_length, pymilvus will set 65535, so just not throw error but to use the default value when don't set max_length.

Expected Behavior

No response

Steps To Reproduce

No response

Milvus Log

No response

Anything else?

No response

[smellthemoon]

/assign

[smellthemoon]

/unassign @yanliang567