Replace 2016 Keywords with 2017 Keywords

function main() {
  var kwIter = AdWordsApp.keywords().withCondition("Text CONTAINS '2016'").get();
  
  while (kwIter.hasNext()) {
   var keyword = kwIter.next();
    
   // create new keyword 
    keyword.getAdGroup().newKeywordBuilder()
    .withText(keyword.getText().replace("2016", "2017"))
    .withCpc(keyword.bidding().getCpc())
    .build(); 
  }
}