title: Mongo Transporter PipeLine Data MisMatch Issue
body: <p>I am using transporter pipeline to get sync my NoSQL DataBases between Source DataBase Mongo (Version=3.4) to Sinc Database Mongo (Version = 4.4).</p>
  <p>Here I established the connection properly by having below configuration in Pipeline.js</p>
  <pre><code>var source = mongodb({ &quot;uri&quot;: &quot;mongodb://parentHost:27017/mongodb?authSource=admin&quot;  &quot;tail&quot;: true})
  
  var sink = mongodb({&quot;uri&quot;: &quot;mongodb://childHostName:27017/mongodb&quot;  &quot;bulk&quot;: true});
  
  t.Config({'write_timeout': '5000s'}).Source(&quot;source&quot;, source, &quot;/^testing$/&quot;).Save(&quot;sink&quot;, sink, &quot;/^testing$/&quot;);
  </code></pre>
  <p>After Setting Above Configuration for Source and Sync Databases I launched my Transporter Pipeline using :-</p>
  <pre><code>`transporter run Pipeline.js`
  </code></pre>
  <p>After Initiating this Pipeline, In child Testing Collection we are getting 60 Documents more than Parent Testing Collection.</p>
  <p>Initially We don't have any Document in our child Testing Collection and having around 278k records in Parent Testing Collection.</p>
  <p>Could you please help if I missed anything to configure.</p>