A user recently had trouble understanding the context and effect of the log message below:

2016-01-28T21:30:18.817+0000 error: E11000 duplicate key error collection: db.coll index: _id_ dup key: { : ObjectId('4d37401365599637bc0046ee') }

It would be helpful for users and support if we provided some additional information that could be helpful in diagnosing the issue e.g. prefixing the log message with the word "insert " or "flush ", etc.

For reference, those logs are from mongorestore. We should make some updates to output more descriptive error messages across the tools.