title: MongoDB remove returning nRemoved 0
body: <p>I am running a remove command against the Mongo Shell which doesn't seem to remove any documents:</p>
  
  <pre><code>C:\Program Files\MongoDB\Server\3.0\bin&gt;mongo outputcachedb --eval "db.CacheItem
  s.remove({ "Expiration" : { "$lte" : new Date() } });"
  2015-04-22T11:30:30.957+0200 I CONTROL  Hotfix KB2731284 or later update is not
  installed, will zero-out data files
  MongoDB shell version: 3.0.2
  connecting to: outputcachedb
  WriteResult({ "nRemoved" : 0 })
  </code></pre>
  
  <p>If I run the same query document using MongoVue it finds (and when requested removes) documents</p>