Bump versions for 6.8.22 release

Author: mark-vieira

.ci/bwcVersions

@@ -88,3 +88,4 @@ BWC_VERSION:
   - "6.8.19"
   - "6.8.20"
   - "6.8.21"
+  - "6.8.22"

buildSrc/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 6.8.22
+elasticsearch     = 6.8.23
 lucene            = 7.7.3
 
 # optional dependencies

server/src/main/java/org/elasticsearch/Version.java

@@ -166,8 +166,9 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_8_20 = new Version(6082099, org.apache.lucene.util.Version.LUCENE_7_7_3);
     public static final Version V_6_8_21 = new Version(6082199, org.apache.lucene.util.Version.LUCENE_7_7_3);
     public static final Version V_6_8_22 = new Version(6082299, org.apache.lucene.util.Version.LUCENE_7_7_3);
-    
-    public static final Version CURRENT = V_6_8_22;
+    public static final Version V_6_8_23 = new Version(6082399, org.apache.lucene.util.Version.LUCENE_7_7_3);
+
+    public static final Version CURRENT = V_6_8_23;
 
     private static final ImmutableOpenIntMap<Version> idToVersion;