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docs fix for doubleMean description (#11513) 

* fix for doubleMean description

* include quantile aggregator description from Suneet

* update hyperlink to quantiles aggregator
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Victoria Lim 2021-07-30 12:39:44 -07:00 committed by GitHub
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@ -126,7 +126,9 @@ Computes and stores the sum of values as 32-bit floating point value. Similar to
### `doubleMean` aggregator
Computes and returns arithmetic mean of a column values as 64 bit float value. This is a query time aggregator only and should not be used during indexing.
Computes and returns arithmetic mean of a column values as 64 bit float value. `doubleMean` is a query time aggregator only. It is not available for indexing.
To accomplish mean aggregation on ingestion, refer to the [Quantiles aggregator](../development/extensions-core/datasketches-quantiles.md#aggregator) from the DataSketches extension.
```json
{ "type" : "doubleMean", "name" : <output_name>, "fieldName" : <metric_name> }