[7.x] Introduce v6.8.11 (elastic#57600)

Author: csoulios

.ci/bwcVersions

@@ -40,6 +40,7 @@ BWC_VERSION:
   - "6.8.8"
   - "6.8.9"
   - "6.8.10"
+  - "6.8.11"
   - "7.0.0"
   - "7.0.1"
   - "7.1.0"

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

@@ -117,6 +117,7 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_8_8 = new Version(6080899, org.apache.lucene.util.Version.LUCENE_7_7_2);
     public static final Version V_6_8_9 = new Version(6080999, LUCENE_7_7_3);
     public static final Version V_6_8_10 = new Version(6081099, LUCENE_7_7_3);
+    public static final Version V_6_8_11 = new Version(6081199, LUCENE_7_7_3);
     public static final Version V_7_0_0 = new Version(7000099, org.apache.lucene.util.Version.LUCENE_8_0_0);
     public static final Version V_7_0_1 = new Version(7000199, org.apache.lucene.util.Version.LUCENE_8_0_0);
     public static final Version V_7_1_0 = new Version(7010099, org.apache.lucene.util.Version.LUCENE_8_0_0);