Is it possible to skip IndexRebuilder in the startup process of mongodb 2.6?

Question

There are more than 10k databases and 100k collections( with indexes) in our Replica Set, and mongod intance startup progress is a very long time job, more than 30 minutes.

And I have set noIndexBuildRetry, and there were lots of logs:

2015-06-06T17:53:45.818+0800 [IndexRebuilder] opening db:  database_000001a
2015-06-06T17:53:45.925+0800 [IndexRebuilder] opening db:  database_000002b
....
2015-06-06T18:33:47.769+0800 [IndexRebuilder] opening db:  database_....

Is it possible to skip IndexRebuilder in the startup process of mongodb 2.6 ?

Any reply will be appreciated.