There is no destructible mesh example in content example package anymore, it has been removed but not replaced in content example project.
Not only that, Destructibles Content Examples | Unreal Engine Documentation doc section for destructible are horrible, fix this please.
also, you can add tim hobsons (ue4 live stream) project as content example)
Destruction should be one of the main features Epic boast about, fortnite has good destruction for 110players. No other games or engines have that good destructions out there except for frostbite.