From d870f6a0c7d147fa6616962559b31d748650b90b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mantas=20Marcinkevi=C4=8Dius?= <marc.mantas@gmail.com>
Date: Mon, 29 Aug 2016 11:31:50 +0300
Subject: [PATCH] added documentation
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.../Pipeline/ExtendedStatsBucket.md | 52 +++++++++++++++++++
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create mode 100644 docs/Aggregation/Pipeline/ExtendedStatsBucket.md
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+# Extended Stats Bucket Aggregation
+
+> More info about extended stats bucket aggregation is in the [official elasticsearch docs][1]
+
+This aggregation provides a few more statistics (sum of squares, standard deviation, etc) compared to the stats_bucket` aggregation.
+
+## Simple example
+
+```JSON
+{
+ "aggs" : {
+ "sales_per_month" : {
+ "date_histogram" : {
+ "field" : "date",
+ "interval" : "month"
+ },
+ "aggs": {
+ "sales": {
+ "sum": {
+ "field": "price"
+ }
+ }
+ }
+ },
+ "stats_monthly_sales": {
+ "extended_stats_bucket": {
+ "buckets_paths": "sales_per_month>sales"
+ }
+ }
+ }
+}
+```
+
+And now the query via DSL:
+
+```php
+$search = new Search();
+
+$dateAggregation = new DateHistogramAggregation('sales_per_month', 'date', 'month');
+$dateAggregation->addAggregation(
+ new SumAggregation('sales', 'price')
+);
+
+$search->addAggregation($dateAggregation);
+$search->addAggregation(
+ new ExtendedStatsBucketAggregation('stats_monthly_sales', 'sales_per_month>sales')
+);
+
+$aggArray = $search->toArray();
+```
+
+[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-extended-stats-bucket-aggregation.html
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