Index Creation fails after 2h with "operation was interrupted" code 11601

I'm trying to create a few indices on a large collection, that I was able to create on MongoDB without problems on the same instance type. Each index took 6-7h to generate. Amazon DocumentDB seems to kill the index creation exactly after 2h with the following response:

{ "ok" : 0, "errmsg" : "operation was interrupted", "code" : 11601 }

Does Amazon DocumentDB impose a 2h limit for index creations?

Deniz