arg_name: param
name: $pipeline
type: array
description: |
  Specifies an :manual:`aggregation pipeline </core/aggregation-pipeline>` operation.
interface: phpmethod
operation: MongoDB\\Collection::aggregate
optional: true
position: 1
---
source:
  ref: $options
  file: apiargs-common-param.yaml
operation: MongoDB\\Collection::aggregate
position: 2
...