Add unreleased v6.1.1 version

Author: danielmitterdorfer

buildSrc/version.properties

@@ -1,5 +1,5 @@
 # When updating elasticsearch, please update 'rest' version in core/src/main/resources/org/elasticsearch/bootstrap/test-framework.policy
-elasticsearch     = 6.1.0
+elasticsearch     = 6.1.1
 lucene            = 7.1.0
 
 # optional dependencies

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

@@ -134,7 +134,9 @@ public class Version implements Comparable<Version> {
         new Version(V_6_0_2_ID, org.apache.lucene.util.Version.LUCENE_7_0_1);
     public static final int V_6_1_0_ID = 6010099;
     public static final Version V_6_1_0 = new Version(V_6_1_0_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
-    public static final Version CURRENT = V_6_1_0;
+    public static final int V_6_1_1_ID = 6010199;
+    public static final Version V_6_1_1 = new Version(V_6_1_1_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
+    public static final Version CURRENT = V_6_1_1;
 
     static {
         assert CURRENT.luceneVersion.equals(org.apache.lucene.util.Version.LATEST) : "Version must be upgraded to ["
@@ -147,6 +149,8 @@ public static Version readVersion(StreamInput in) throws IOException {
 
     public static Version fromId(int id) {
         switch (id) {
+            case V_6_1_1_ID:
+                return V_6_1_1;
             case V_6_1_0_ID:
                 return V_6_1_0;
             case V_6_0_2_ID: