Update upgrade.html.md for breaking changes

kiennh2909 · Sep 17, 2017 · 018ea8e · 018ea8e
1 parent 9340561
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diff --git a/docs/manual/source/resources/upgrade.html.md b/docs/manual/source/resources/upgrade.html.md
@@ -36,6 +36,13 @@ To upgrade and use new version of PredictionIO, do the following:
 
 In addition, please take notes of the following for specific version upgrade.
 
+## Upgrade to 0.12.0
+
+In 0.12.0, Elasticsearch 5.x client has been reimplemented as a singleton.
+Engine templates directly using Elasticsearch 5.x StorageClient require
+update for compatibility. See [pull request]
+(https://github.com/apache/incubator-predictionio/pull/421) for details.
+
 ## Upgrade to 0.11.0
 
 Starting from 0.11.0, PredictionIO no longer bundles any JDBC drivers in the