docs(changelog): updated changelog with ES PR #7154

CHANGELOG.md

@@ -8,6 +8,9 @@
 * **Graph**: Fixed graph legend table mode and always visible scrollbar [#6828](https://github.com/grafana/grafana/issues/6828)
 * **Templating**: Fixed template variable value groups/tags feature [#6752](https://github.com/grafana/grafana/issues/6752)
 
+## Enhancements
+* **Elasticsearch**: Added support for all moving average options [#7154](https://github.com/grafana/grafana/pull/7154), thx [@vaibhavinbayarea](https://github.com/vaibhavinbayarea)
+
 # 4.1-beta1 (2016-12-21)
 
 ### Enhancements