title: Is there a way to revert or undo replica set configuration
body: <p>I have two standalone nodes, which have mongodb running on them. Both of them have a replica set configuration <em><strong>rs0</strong></em> and start with <code>rs.initiate()</code>.<br />
  But in some scenarios, I want them to run as individual nodes, but in some cases, I want one to become primary and one to become secondary. But since I have done <code>rs.initiate()</code> on both, I won't be able to add any node as secondary.<br />
  So is there a way to undo the replica set configuration so that I can enable adding the secondary node.</p>