title: Update multiple documents and return all updated documents
body: <p>I am looking for a way to update many documents at once using <code>mongoose</code> and return all the modified documents. I tried with setting <code>multi:true</code> in <a href="http://mongoosejs.com/docs/api.html#query_Query-update" rel="noreferrer">update()</a>. It is updating all matching documents but not returning any. Then I tried with <a href="http://mongoosejs.com/docs/api.html#query_Query-findOneAndUpdate" rel="noreferrer">findOneAndUpdate()</a>. It is updating and returning only one document even if there are many matching ones. Yeah, the function name itself tells, it will update only one, still I tried. I could not set option like <code>multi:true</code> in <code>findOneAndUpdate()</code>. How can it be done? Thanks in advance</p>