[Bug]: Milvus should report error if the search params hint is not supported

[yanliang567]

Is there an existing issue for this?

• I have searched the existing issues

Environment

- Milvus version: 2.5.0
- Deployment mode(standalone or cluster): standalone
- MQ type(rocksmq, pulsar or kafka):    
- SDK version(e.g. pymilvus v2.0.0rc2): pymilvus-2.5.1

Current Behavior

search just ignore the hint

Expected Behavior

reports error if the hint is not support. Or the user could be confused about the results

Steps To Reproduce

search with not support hints, such as:
search_params = {'hints': "not_supported_hint",
                         'params': {}}

Milvus Log

No response

Anything else?

No response

[yanliang567]

/assign @chasingegg
/unassign