[6.x] [docs/vis] document Top Hit metric agg (#20433) (#22096)

Backports the following commits to 6.x:
 - [docs/vis] document Top Hit metric agg  (#20433)
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Spencer 2018-08-16 16:05:02 -07:00 committed by GitHub
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@ -14,6 +14,9 @@ numeric field. Select a field from the drop-down.
the number of unique values in a field. Select a field from the drop-down.
*Standard Deviation*:: The {ref}/search-aggregations-metrics-extendedstats-aggregation.html[_extended stats_]
aggregation returns the standard deviation of data in a numeric field. Select a field from the drop-down.
*Top Hit*:: The {ref}/search-aggregations-metrics-top-hits-aggregation.html[_top hits_]
aggregation returns one or more of the top values from a specific field in your documents. Select a field from the drop-down,
how you want to sort the documents and choose the top fields, and how many values should be returned.
*Percentiles*:: The {ref}/search-aggregations-metrics-percentile-aggregation.html[_percentile_] aggregation divides the
values in a numeric field into percentile bands that you specify. Select a field from the drop-down, then specify one
or more ranges in the *Percentiles* fields. Click the *X* to remove a percentile field. Click *+ Add* to add a