Hello,
After a bad server/mongod shutdown, I am unable to restart Mongod. I'm 99% confident that my issue is that same as #SERVER-26103.
Repair command is not possible, because of the following error :
2017-05-22T13:26:25.739+0200 I CONTROL [initandlisten] options: { repair: true, storage:

}
2017-05-22T13:26:25.758+0200 I - [initandlisten] Detected data files in /home/mongodb/ created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2017-05-22T13:26:25.762+0200 I STORAGE [initandlisten] exception in initAndListen: 72 Requested option conflicts with current storage engine option for directoryForIndexes; you requested false but the current server storage is already set to true and cannot be changed, terminating

I join to this ticket the wirertiger.wt files, and i hope that someone can repair it
Thanks for your help