Add 5.3 version

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

@@ -103,6 +103,8 @@ public class Version implements Comparable<Version> {
     public static final Version V_5_1_2_UNRELEASED = new Version(V_5_1_2_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
     public static final int V_5_2_0_ID_UNRELEASED = 5020099;
     public static final Version V_5_2_0_UNRELEASED = new Version(V_5_2_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
+    public static final int V_5_3_0_ID_UNRELEASED = 5030099;
+    public static final Version V_5_3_0_UNRELEASED = new Version(V_5_3_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
     public static final int V_6_0_0_alpha1_ID_UNRELEASED = 6000001;
     public static final Version V_6_0_0_alpha1_UNRELEASED =
         new Version(V_6_0_0_alpha1_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
@@ -123,6 +125,8 @@ public class Version implements Comparable<Version> {
         switch (id) {
             case V_6_0_0_alpha1_ID_UNRELEASED:
                 return V_6_0_0_alpha1_UNRELEASED;
+            case V_5_3_0_ID_UNRELEASED:
+                return V_5_3_0_UNRELEASED;
             case V_5_2_0_ID_UNRELEASED:
                 return V_5_2_0_UNRELEASED;
             case V_5_1_2_ID_UNRELEASED: