Slow query log for $search queries and getMores includes this section today:

“mongot”: {
“cursorid”: 22318,
“timeWaitingMillis”: 36365
} 

I suggest we include the number of getMores calls to mongot performed. For long running queries with a blocking stage such as $group and $sort, this will be very useful for debugging purposes. 

This will be incredibly important if we ever pushdown $limit to mongot, and when mongot will be returning variable batch sizes.