Datastore.runQuery with .on('data') doesn't demonstrate how to "abort"?

[jgeewax]

In a for-loop, I can call break; to exit. When I'm in a runQuery stream, I'm unsure how to exit early. Is there a way to document that?

Ie, it might be...

datastore.runQuery(query)
  .on('data', function(entity) {
    if (my exit criteria) this.exit(); // ?
  });

[callmehiphop]

All the streaming APIs can be exited early via this.end(). It would appear that runQuery is one of the few places we don't have that documented, I'll put together a PR with some doc updates