Configuring switch failover on Fortigate100D in version 5.4.1

Hello, I have a Fortigate100D cluster and i would like to configure failover of  hardware switch.  I would like to connect my clients directly to Fortigate100D.

I was able to do it version 5.2 with the following documentation  'Configuring redundant architecture using two FortiGates and internal switching". Unfortunately some commands have disappeared in version 5.4 ( no more "set virtual-switch-vlan enable" ) and the document is not up to date now. I was adviced to use set type switch-vlan but i cant find this option, I only have set type physical.

I will need some help for it Cordialement,