The function To Check Custom Record Contains a Record Id

     function customRecordSearch(soId) {
                var myCustomListSearch = search.create({
                    type: "customrecord_cl_shopify_integ_cl_468",
                    filters:
                        [
                            ["custrecord_cl_sales_order", "anyof", soId]
                        ],
                    columns:
                        [
                            search.createColumn({ name: "internalid", label: "Internal ID" })
                        ]
                });
                var resultSet = myCustomListSearch.run();

                var results = resultSet.getRange({ start: 0, end: 1 });
                let internalId;
                for (var i in results) {
                    internalId = results[i].getValue({ name: "internalid", label: "Internal ID" });
                };
                //log.debug("internalId", internalId);
                return internalId;
            }