Update the 2.8.2 release notes with recently merged fixes

Change-Id: Id8796338895121472a3b7a4c48646fe086f34c1f

ReleaseNotes/ReleaseNotes-2.8.2.txt

@@ -8,6 +8,22 @@ link:https://gerrit-releases.storage.googleapis.com/gerrit-2.8.2.war[
 https://gerrit-releases.storage.googleapis.com/gerrit-2.8.2.war]
 
 
+Lucene Index
+------------
+
+* Support committing Lucene writes within a fixed interval.
++
+The `ramBufferSize` and `maxBufferedDocs` options control how often the
+writer is flushed, but this does not fsync files on disk and thus
+might not be permanent, particularly in a machine under heavy load.
++
+As a result, commits to the index may not be completed, and updates may
+be lost if the server goes down.
++
+A new option `commitWithin` is added, to control how frequently the
+indexes are committed.
+
+
 General
 -------
 
@@ -49,6 +65,14 @@ index.
 Running a query with `limit:0` when the secondary index is enabled was causing
 an internal server error.
 
+* link:https://code.google.com/p/gerrit/issues/detail?id=2331[Issue 2331]:
+Make sure change-merged event contains correct patch set number.
++
+When a change is submitted with the cherry-pick strategy, or when the
+change is rebased with the "rebase if necessary" strategy, a new patch
+set is created.  The newly created patch set was not being set in the
+change-merged event.
+
 * Remove dependency on joda time library in gerrit launcher.
 +
 The joda time library was being unnecessarily packaged in the root of