The lack of keysExamined/docsExamined in getMores makes it more difficult to determine the efficiency of indexes beyond the first batch (numYields, nreturned, reslen don't provide the same sort of metrics). In a test environment, it might be possible to increase the batchSize of the initial find to see how efficient a query is. However, in a production environment, this is not generally viable.

Opening a sub-task to consider adding keysExamined/docsExamined in getMores in the v3.2 branch.