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[Maps] add unique count metric aggregation (#48961)

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* [Maps] add unique count metric aggregation

* do not format unique_count aggregation results

* do not format value in legend for unique count

* update heatmap docs

* one more doc change
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Nathan Reese 2019-10-24 14:57:46 -06:00 • committed by GitHub
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docs/maps/heatmap-layer.asciidoc
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@ -13,6 +13,6 @@ You can create a heat map layer from the following data source:
Set *Show as* to *heat map*.
The index must contain at least one field mapped as {ref}/geo-point.html[geo_point].
NOTE: Only count and sum metric aggregations are available with the grid aggregation source and heat map layers.
Mean, median, min, and max are turned off because the heat map will blend nearby values.
NOTE: Only count, sum, unique count metric aggregations are available with the grid aggregation source and heat map layers.
Average, min, and max are turned off because the heat map will blend nearby values.
Blending two average values would make the cluster more prominent, even though it just might literally mean that these nearby areas are average.