Provide aggregation stage to abort pipeline halfway through

We have some slow large aggregation pipelines where a $limit at the end is not sufficient to prevent slow queries, and where a $limit early in the pipeline would give incorrect results.

Hence we want to have a way to limit early but abort the query instantly if this limit is hit:

For example:

aggregate([

   { $match: {....}},

   { $imaginaryNewAbortOnCondition: { 

        count: {$gt: 100}, 

        message: "Too many rockets found, please limit the search range"

     }

   },

   { $lookupUnwindOrOtherExpensiveAggregations: {...}},

   { $limit: 100 }

])

I think limit is our main use case but one could also imagine other uses where a more dynamic condition is useful.