title: Can i delete default MongoDB Index?
body: <p>I have one collection for  which I don't need any index. I just store user search term and date, so my collection is really simple.</p>
  
  <pre><code>class UserSearch {
  
  public string Term {get; set;}
  pulic DateTime Date {get;set;}
  
  }
  </code></pre>
  
  <p>When I store one UserSearch item, my collection have _id and default index on it.</p>
  
  <p>From my knowledge, those "_id" fields will be indexed in ram, so I don't want to spend ram memory for collection which I just store and I'm calculating something every 12 hours.</p>
  
  <p>I try to delete it, but I can't.</p>
  
  <pre><code>   var indexes = UserSearch(true).GetIndexes();
  
     //delete UserSearch Default Index
     if(UserSearch(true).IndexExistsByName("_id_"))
     {
       UserSearch(true).DropIndexByName("_id_");
     }
  </code></pre>
  
  <p>Any suggestion/solution?</p>