code: public OperationFuture<FirewallPolicy> update(FirewallPolicy firewallPolicy, FirewallPolicyConfig config) {
          FirewallPolicyMetadata metadata = findByRef(firewallPolicy);
  
          firewallPolicyClient.update(
              metadata.getDataCenterId(),
              metadata.getId(),
              composeFirewallPolicyRequest(config)
          );
  
          return new OperationFuture<>(
              firewallPolicy,
              new NoWaitingJobFuture()
          );
      }
docs: Update firewall policy
  
  @param firewallPolicy firewall policy
  @param config firewall policy config
  @return OperationFuture wrapper for firewall policy