[DOCS] Fix typo in bucket sum aggregation docs (#50431)

Florian Kelbert · jrodewig · commit af8bed13d323 · 2019-12-20T08:48:25.000-05:00
diff --git a/docs/reference/aggregations/pipeline/sum-bucket-aggregation.asciidoc b/docs/reference/aggregations/pipeline/sum-bucket-aggregation.asciidoc
@@ -1,7 +1,7 @@
 [[search-aggregations-pipeline-sum-bucket-aggregation]]
 === Sum Bucket Aggregation
 
-A sibling pipeline aggregation which calculates the sum across all bucket of a specified metric in a sibling aggregation.
+A sibling pipeline aggregation which calculates the sum across all buckets of a specified metric in a sibling aggregation.
 The specified metric must be numeric and the sibling aggregation must be a multi-bucket aggregation.
 
 ==== Syntax
