running vault read -format=json produces warning in audit log

[jhrcz-ls]

Describe the bug
when doing vault read -format=json <somepath> we get in audit log warning
Endpoint ignored these unrecognized parameters: [-format] (its in field message.response.warnings in case of our logging of audit log to ELK)

To Reproduce
Steps to reproduce the behavior:

1. Run vault read -format=json <somepath> ...
2. See error in audit log

Expected behavior
no warning happens because i expect this is the correct parametr position

Environment:

• Vault Server Version (retrieve with vault status): 2.0.3
• Vault CLI Version (retrieve with vault version): 2.0.4
• Server Operating System/Architecture: linux/amd64

Additional info
i see that the request goes to /v1/myengine/some/path/mysecret?-format=json

[jhrcz-ls]

looks like this works correct and important is that there are not some logs from requests on the way to ELK that could be confused with latest commands run.