Retrieves the last error code (if any) from the database server.
Exact object format is not documented. MongoErrorDescription signature will be updated upon any issues. Note that this method will execute a query to service collection and thus is far from being "free".
.db .mongo .connection ._MongoErrorDescription) getLastError();
struct storing data from MongoDB db.getLastErrorObj() object
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Subject to the terms of the MIT license, as written in the included LICENSE.txt file.