search.createColumn({
                            name: "custbody_created_from_externalid",
                            join: "paidTransaction",
                            summary: "COUNT",
                            label: "# of Sales Order External Id's"
                        })

I’m adding this column to a search, how do I get it’s value? I’ve tried:

var numOfSalesorders = result.getValue({
                    name: "custbody_created_from_externalid"
                });