title: MongoDB 2.4.9 key too large
body: <p>I receive these errors:</p>
  
  <pre><code>ERROR: key too large len:2448 max:1024
  </code></pre>
  
  <p>and </p>
  
  <pre><code>[conn89] unindex failed (key too big?)
  </code></pre>
  
  <p>I'm using MongoDB 2.4.9 . Any Idea how can I fix these errors?</p>