How would you test Aggregation Pipeline?

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Use the parent topic “Aggregation Pipeline” as context. Cover testing approach, production metrics, or scale impact as asked — then refine with AI Mentor below.

Parent context — Aggregation Pipeline

Common mistakes: $lookup before $match blowing working set; missing allowDiskUse on huge sorts. Best practices: Index fields in initial $match; $project early to trim fields.

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#mongo-aggregation#architect