I have below div element with ID
//*[@id="productcontainer"] and get all links inside this div and click on each in loop.
This is a good question for the mailing list https://groups.google.com/forum/#!forum/nightwatchjs
May be late to the party, but for what it's worth the format for reading through issues is much better on github for the developers who use it - not sure about internally for nightwatch in terms of handling the activity.