title: AWS DMS Source MongoDB and Target RDS Postgres Full load not happening but ongoing replication happens
body: <p>I created a DMS task:
  Source - MongoDB
  Target - RDS Postgres</p>
  <p>I have <strong>successfully working pipelines with full load + Ongoing replication working.</strong></p>
  <p>But for some <strong>collections</strong> in my source mongo when I create Full load or Full load + Ongoing replication,
  <strong>Task shows successfully completed and starts ongoing replication.</strong>
  But Full load doesn't happens only schema gets created in postgres with 0 rows, and Ongoing replication starts.
  CloudWatch shows no error even after detailed debug.
  <a href="https://i.stack.imgur.com/Xkvlv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Xkvlv.png" alt="enter image description here" /></a></p>