Bump version from 6.3.0 to 6.3.1

Author: dimitris-athanasiou

buildSrc/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 6.3.0
+elasticsearch     = 6.3.1
 lucene            = 7.3.1
 
 # optional dependencies

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

@@ -162,11 +162,11 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_2_3 = new Version(V_6_2_3_ID, LUCENE_7_2_1);
     public static final int V_6_2_4_ID = 6020499;
     public static final Version V_6_2_4 = new Version(V_6_2_4_ID, LUCENE_7_2_1);
-    public static final int V_6_2_5_ID = 6020599;
-    public static final Version V_6_2_5 = new Version(V_6_2_5_ID, LUCENE_7_2_1);
     public static final int V_6_3_0_ID = 6030099;
     public static final Version V_6_3_0 = new Version(V_6_3_0_ID, org.apache.lucene.util.Version.LUCENE_7_3_1);
-    public static final Version CURRENT = V_6_3_0;
+    public static final int V_6_3_1_ID = 6030199;
+    public static final Version V_6_3_1 = new Version(V_6_3_1_ID, org.apache.lucene.util.Version.LUCENE_7_3_1);
+    public static final Version CURRENT = V_6_3_1;
 
     static {
         assert CURRENT.luceneVersion.equals(org.apache.lucene.util.Version.LATEST) : "Version must be upgraded to ["
@@ -179,10 +179,10 @@ public static Version readVersion(StreamInput in) throws IOException {
 
     public static Version fromId(int id) {
         switch (id) {
+            case V_6_3_1_ID:
+                return V_6_3_1;
             case V_6_3_0_ID:
                 return V_6_3_0;
-            case V_6_2_5_ID:
-                return V_6_2_5;
             case V_6_2_4_ID:
                 return V_6_2_4;
             case V_6_2_3_ID: