public boolean isVespaCloud() { 
        return vespaCloudTenant != null && vespaCloudApplication != null; 
    }
Validates that if one of the Vespa Cloud parameters is set, all required
parameters are also set correctly.

@throws IllegalArgumentException if validation fails
integration/logstash-plugins/logstash-output-vespa/src/main/java/org/logstashplugins/QuickStartConfig.java