title: Error while upgrading Mongodb from 3.2 to 3.6
body: <p>I needed to upgrade mongodb from 3.2 to 3.6 in my environment. For the process i first migrated from 3.2 to 3.4 as recommended. After successful migration to 3.4, i started migration to 3.6 i am not able to start mongod. When checked log file i found error like:
   <strong>IMPORTANT: UPGRADE PROBLEM: The data files need to be fully upgraded to version 3.4 before attempting an upgrade to 3.6; see <a href="http://dochub.mongodb.org/core/3.6-upgrade-fcv" rel="noreferrer">http://dochub.mongodb.org/core/3.6-upgrade-fcv</a> for more details.</strong></p>
  
  <p>MY Mongod.conf</p>
  
  <p>systemLog:
    destination: file
    logAppend: true
    path: /var/log/mongodb/mongod.log</p>
  
  <p>storage:
    dbPath: /var/lib/mongo
    journal:
      enabled: true</p>
  
  <p>processManagement:
    fork: true  # fork and run in background
    pidFilePath: /var/run/mongodb/mongod.pid  # location of pidfile</p>
  
  <p>net:
    port: 27017
    bindIp: 127.0.0.1</p>