CLI returns following :

query-timeout" =>

{ "description" => "Any configured query timeout in seconds The default is no timeout", "type" => LONG, "required" => false, "access-type" => "read-write", "storage" => "configuration", "restart-required" => "no-services" }

,

The description says : "The default is no timeout" whereas no "default" attribute of query-timeout is being returned i.e the result should have looked like :
query-timeout" =>

{ "description" => "Any configured query timeout in seconds The default is no timeout", "type" => LONG, "required" => false, "access-type" => "read-write", "default" => .... "storage" => "configuration", "restart-required" => "no-services" }

,