Median Aggregation

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A single-value metrics aggregation that computes the median of numeric values that are extracted from the aggregated documents.

The median is the value separating the higher half from the lower half of a data sample, it may be thought of as the “middle” value. ¹

Type	Description	Example	Result
Mean (or Average)	Sum of values of a data set divided by number of values	(1+2+2+3+4+7+9) / 7	4
Median	Middle value separating the greater and lesser halves of a data set	1, 2, 2, 3, 4, 7, 9	3
Mode	Most frequent value in a data set	1, 2, 2, 3, 4, 7, 9	2

SEARCH /bank/

{
  "_query": "*",
  "_limit": 0,
  "_check_at_least": 1000,
  "_aggs": {
    "balance_median": {
      "_median": {
        "_field": "balance"
      }
    }
  }
}

¹ Median