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Collection Methods (aggregate (pipeline operators ($bucket (output (e.g. {…

- - - - Allows categorize and group incoming documents the same input data with different DAGs (array of pipeline operations) and output results respectively.
        Input data will be read from DB only once.
    - - output
        
        e.g. {
        "count" : {$sum : 1},
        "output-field-name": {$push: $src-field-name}
        }
        
        define fields to contain in output doc
      - default
        
        bucket _id for docs not in the defined boundaries.
      - boundaries
        
        define the buckets in an array like [0, 50, 100, 200]
      - groupBy
        
        map each doc into a number for bucketing
      - "count" : {$sum : 1}
        
        number of documents in the bucket
      - _id
        
        inclusive lower bound of the bucket
      - Categorizes incoming documents into groups
    - - granularity
        
        use one of ISO preferred number series to define bucket boundaries
      - buckets
        
        num of buckets to create
    - - count a field or expression, and sort in desc.
      - {"_id": "term to count", "count": count}