title: Mongodb exception, " MongoCursorException' with message '$ operator made object too large" What does it mean?
body: <pre><code>MongoCursorException' with message '$ operator made object too large
  </code></pre>
  
  <p>I was trying to update some objects with an update command like</p>
  
  <pre><code>$collection-&gt;update({"_id" =&gt; array('$in' =&gt; array(2,3,4,5)) } ....)
  </code></pre>
  
  <p>and got this exception. Any hints about what it means ? So that I can proceed to debug.</p>