Hi Team, I have restored complete database from mongo 2.6.6 to mongodb 3.4.5, when we migrate 3.0 database completed database is recovered same as earlier version. As the schema changed from 3.2 and 3.4. The database path file are scatted as collections and indexes but not in folder structure.

We used mongodump and mongorestore commands for dump and restore the database

But when I see the database from Robomongo, it show solder sturcture but missing system.indexes. We are unable to import this file name starting with system.
when we try to create indexes, system throws duplicate record
Attached the screen shots in word document.
Please guide us in the update of servers.