Ignore API key failure from elastic cluster log

Hi,

For various reasons we have a lot of agents in the wild attempting to connect with aged API keys, e.g.:

[o.e.x.s.a.ApiKeyAuthenticator] [node] Authentication using apikey failed - unable to find apikey with id

Does anyone know a way to exclude these from being logged into the cluster log on servers? they have little to no value for us based on what we're doing with Elastic.

Thanks!