title: Migrating data from old container to new partitioned container using change feed
body: <p>1.Is using azure cosmosdb changefeed right approach, to migrate data from old containers to new partitioned containers?<br/>
  2.Will azure cosmosdb changefeed have documents which are not at all modified even once till now?<br/>
  3.If above are true, what are the steps involved in migrating data using azure cosmosdb change feed.</p>