func (a *Aggregate) Execute(ctx context.Context) error {
	if a.deployment == nil {
		return errors.New("the Aggregate operation must have a Deployment set before Execute can be called")
	}
	return driver.Operation{
		CommandFn:         a.command,
		ProcessResponseFn: a.processResponse,
		Client:                         a.session,
		Clock:                          a.clock,
		CommandMonitor:                 a.monitor,
		Database:                       a.database,
		Deployment:                     a.deployment,
		ReadConcern:                    a.readConcern,
		ReadPreference:                 a.readPreference,
		Type:                           driver.Read,
		RetryMode:                      a.retry,
		Selector:                       a.selector,
		WriteConcern:                   a.writeConcern,
		Crypt:                          a.crypt,
		MinimumWriteConcernWireVersion: 5,
	}.Execute(ctx, nil)
}
Execute runs this operations and returns an error if the operaiton did not execute successfully.
package operation
import (
	"context"
	"errors"
	"go.mongodb.org/mongo-driver/bson/bsontype"
	"go.mongodb.org/mongo-driver/event"
	"go.mongodb.org/mongo-driver/mongo/description"
	"go.mongodb.org/mongo-driver/mongo/readconcern"
	"go.mongodb.org/mongo-driver/mongo/readpref"
	"go.mongodb.org/mongo-driver/mongo/writeconcern"
	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
	"go.mongodb.org/mongo-driver/x/mongo/driver"
	"go.mongodb.org/mongo-driver/x/mongo/driver/session"
)
type Aggregate struct {
	allowDiskUse             *bool
	batchSize                *int32
	bypassDocumentValidation *bool
	collation                bsoncore.Document
	comment                  *string
	hint                     bsoncore.Value
	maxTimeMS                *int64
	pipeline                 bsoncore.Document
	session                  *session.Client
	clock                    *session.ClusterClock
	collection               string
	monitor                  *event.CommandMonitor
	database                 string
	deployment               driver.Deployment
	readConcern              *readconcern.ReadConcern
	readPreference           *readpref.ReadPref
	retry                    *driver.RetryMode
	selector                 description.ServerSelector
	writeConcern             *writeconcern.WriteConcern
	crypt                    *driver.Crypt
	result driver.CursorResponse
}
func NewAggregate(pipeline bsoncore.Document) *Aggregate {
	return &Aggregate{
		pipeline: pipeline,
	}
}
func (a *Aggregate) Result(opts driver.CursorOptions) (*driver.BatchCursor, error) {
	clientSession := a.session
	clock := a.clock
	return driver.NewBatchCursor(a.result, clientSession, clock, opts)
}
func (a *Aggregate) ResultCursorResponse() driver.CursorResponse {
	return a.result
}
func (a *Aggregate) processResponse(response bsoncore.Document, srvr driver.Server, desc description.Server, currIndex int) error {
	var err error
	a.result, err = driver.NewCursorResponse(response, srvr, desc)
	return err
}