title: MongoDB How to copy selected sample rows into another new collection
body: <p>I want to copy the output of the below MongoDB Aggregate query and make it a new collection :</p>
  
  <pre><code>  db.fd2000.aggregate([{
       $sample: {
           size: 333333
          }
      }], {
       allowDiskUse: true
    })
  </code></pre>
  
  <p>I am selecting a sample from the fd2000 collection and now want to copy this into a new collection say fd2ksample.</p>
  
  <p>How do I do that?</p>
  
  <p>A thousand thanks for your answers in advance !</p>