title: Mongo findAndUpdate for updating multiple documents
body: <p>I am attempting to use mongo findAndUpdate to update multiple documents and keep receiving syntax error:</p>
  
  <pre><code>db.forecasts.findAndModify({
     query: {forDate: ISODate("2016-02-25T05:00:00.000+0000")},
     update: {
        { $set: {forDate: ISODate("2016-02-23T05:00:00.000+0000")}}, 
        {multi: true}
       }
     })
  </code></pre>
  
  <p>Alternately I also tried:</p>
  
  <pre><code>db.forecasts.update({
     {'forDate': ISODate("2016-02-25T05:00:00.000+0000")},
     {'forDate': ISODate("2016-02-23T05:00:00.000+0000")}, 
     {multi: true}  
     })
  </code></pre>
  
  <p>The error I receive is :
  <code>Error at line 2 position 3: &lt;missing ')</code>'</p>