MongoDB 3.4 has brought out a number of new, very useful aggregation operators for both recursive search ($graphLookup), and faceted search ($bucket, $bucketAuto, $facet, $sortByCount).
|$bucket||Categorizes incoming documents into groups, called buckets, based on a specified expression and bucket boundaries.|
|$bucketAuto||Categorizes incoming documents into a specific number of groups, called buckets, based on a specified expression. Bucket boundaries are automatically determined in an attempt to evenly distribute the documents into the specified number of buckets.|
|$facet||Processes multiple aggregation pipelines within a single stage on the same set of input documents. Enables the creation of multi-faceted aggregations capable of characterizing data across multiple dimensions, or facets, in a single stage.|
|$sortByCount||Categorizes or groups incoming documents by a specified expression to compute the count for each group. Output documents are sorted in descending order by the count.|
|$graphLookup||Performs a recursive search on a collection. To each output document, adds a new array field that contains the traversal results of the recursive search for that document.|
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