Add $top/$bottom/$topN/$bottomN as expressions

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      It is rather awkward that to get topN array elements, you would do $sortArray+$slice while there's topN accumulator available.

      Proposing: 

      $topN: {input: <expression resolving to array>, n: <n expression>, sortBy: <spec>}

      e.g.:

      [
  {
    $set: {
      topThreeOptions: {
        $topN: {
          input: "$options",
          n: 3,
          sortBy: { votes: -1 },
        },
      },
      fiveWatchersAZ: {
        $topN: {
          input: "$watchers",
          n: 5,
          sortBy: 1
        },
      },
    },
  },
]

            Assignee:
            Luke Sanderson
            Reporter:
            Katya Kamenieva
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              Created:
              Updated: