mongodb - Mongo "E11000 duplicate key error" does not indicate which index caused the error when using WiredTiger -

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i have mongo collection contains documents 

{_id : "thing1", version : 123 }

i have created secondary index on version column value must unique across documents in collection

{ v: 1, unique: true, key: { version: -1 } }

when use mmapv1, if attempt insert duplicate document (that conflicts against version key) error says

e11000 duplicate key error index: local.sample.$version_-1 dup key: { : 1 }

but if i'm using wiredtiger, don't index anymore:

e11000 duplicate key error dup key: { : 1 }

i use index determine column failure can retry differently depending on failure. there in configuration that's causing value missing error?

note: using mongo 3.0

it looks bug in mongo 3.0.0. servers running app weren't having issue, local machine , couldn't figure out different between 2 when realized server running mongo 3.0.3.

upgrading local machine 3.0.3 or newer resolved issue.


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