title: How to clone a collection from one MongoDB to another on same server
body: <p>I'm using Mongo 3.2. I have two databases on my localhost named <strong>client1</strong> and <strong>client2</strong>.
  Now <strong>client1</strong> contains a collection named <strong>users</strong>.
  I want to clone this collection to <strong>client2</strong>.</p>
  
  <p>I have tried:-</p>
  
  <blockquote>
    <p>use client2</p>
    
    <p>db.cloneCollection('localhost:27017', 'client1.users',
                        { 'active' : true } )</p>
  </blockquote>
  
  <p>This outputs </p>
  
  <blockquote>
    <p>{
        "ok" : 0.0,
        "errmsg" : "can't cloneCollection from self"
    }</p>
  </blockquote>
  
  <p>Is cloning a collection from one db to another on the same server prohibited?</p>