Update 2.16.1 release notes

Change-Id: I9fbe09800e975b48b72f1ff9bdb26b613b42b360
diff --git a/pages/site/releases/2.16.md b/pages/site/releases/2.16.md
index f7f7831..a6aad39 100644
--- a/pages/site/releases/2.16.md
+++ b/pages/site/releases/2.16.md
@@ -494,6 +494,31 @@
 * [Issue 10021](https://bugs.chromium.org/p/gerrit/issues/detail?id=10021):
 Quote and encode project names in download commands.
 
+* [Issue 10143](https://bugs.chromium.org/p/gerrit/issues/detail?id=10143):
+Fix internal server error when running the `kill` command.
+
+* [Issue 9768](https://bugs.chromium.org/p/gerrit/issues/detail?id=9768):
+Explicitly set the number of shards and replicas for Elasticsearch, and
+allow them to be configured.
+
+  From Elasticsearch version 7 the default number of shards per node
+  will be changed from 5 to 1.
+
+  The number of shards and number of replicas are now explicitly set when
+  creating the index.
+
+  The new settings `elasticsearch.numberOfShards` and `elasticsearch.numberOfReplicas`
+  allow the values to be configured. The default values are 5 and 1,
+  respectively, which is the same as the default values used by Elasticsearch
+  prior to version 7.
+
+* Discontinue support for Elasticsearch 2.4.
+
+* Add preliminary support for Elasticsearch 7.
+
+  Support for Elasticsearch 7 is added, and tested against the `alpha1`
+  release.
+
 * Fix internal server error when listing reviewers of a change with reviewers by email.
 
   Reviewers by email don't have an account ID but formatting reviewers as
@@ -506,6 +531,12 @@
   implementation, which meant it was not possible for plugins to
   provide a different implementation as intended.
 
+* Do not create index on `account_group_members` table in postgres database.
+
+  The `account_group_members` table was deleted, but the postgres
+  setup still tried to create an index on it, which prevented a new
+  site from starting up.
+
 * Don't serve Polygerrit UI when running in headless mode.
 
 * Don't serve static resources when running in slave mode.