Interface CollectionAggregationOptions

allowDiskUse lets the server know if it can use disk to store temporary results for the aggregation (requires mongodb 2.6 >).

Allow driver to bypass schema validation in MongoDB 3.2 or higher.

Return the query as cursor, on 2.6 > it returns as a real cursor on pre 2.6 it returns as an emulated cursor.

Explain returns the aggregation execution plan (requires mongodb 2.6 >).

maxTimeMS specifies a cumulative time limit in milliseconds for processing operations on the cursor. MongoDB interrupts the operation at the earliest following interrupt point.