title: Mongoose Stream, how to update each doc?
body: <p>I want to update n number of docs based on an array of updateIds. I'm using Mongoose Stream .on('data, function() {}). Which is properly finding all the right docs. But now I'm not sure how to update each doc. Can I just write something like doc.update({query}, {key: value}) inside the on.('data', function(doc){}) ?</p>
  
  <pre><code>Wine.find({
      '_id': { $in: updateIds}
  }).stream()
      .on('data', function(doc){
          // how do I update a doc property here?
      })
      .on('error', function(error) {
          throw error;
      })
      .on('end', function() {
          // final callback
      });
  </code></pre>