Running both commands on mongod gives following errors.
> db.runCommand({ aggregate : "foo", pipeline : [{ $match: { i: 0 } }], maxTimeMS: 1000 }) { "ok" : 0, "errmsg" : "unrecognized field 'maxTimeMS'" } > db.runCommand({collMod: "foo", usePowerOf2Sizes : false, maxTimeMS: 1000 }); { "ok" : 0, "errmsg" : "unknown option to collMod: maxTimeMS" }