title: Mongodb numbers in collection name
body: <p>i'm playing around with mongodb from some weeks ago, and suddenly appeared collections with duplicate names and a number attached to it some like:</p>
  
  <pre><code>coleccion_nueva_56b41cc944bd390932e79827
  </code></pre>
  
  <p>I don't know why this collection appeared suddenly, if that is good, bad or normal and what to do with it.</p>