| db.events.aggregate( | |
| [ | |
| { $match: { "payload.action": { $exists: true } } }, | |
| { $group: { _id: "$payload.action", total: { $sum: 1 } } }, | |
| { $sort: { total: 1 } } | |
| ], | |
| { allowDiskUse: true, cursor: { batchSize: 100000000 } } | |
| ); |
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