Add version 5.4.3 after release

Author: danielmitterdorfer

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

@@ -80,6 +80,8 @@ public class Version implements Comparable<Version> {
     public static final Version V_5_4_1 = new Version(V_5_4_1_ID, org.apache.lucene.util.Version.LUCENE_6_5_1);
     public static final int V_5_4_2_ID = 5040299;
     public static final Version V_5_4_2 = new Version(V_5_4_2_ID, org.apache.lucene.util.Version.LUCENE_6_5_1);
+    public static final int V_5_4_3_ID = 5040399;
+    public static final Version V_5_4_3 = new Version(V_5_4_3_ID, org.apache.lucene.util.Version.LUCENE_6_5_1);
     public static final int V_5_5_0_ID = 5050099;
     public static final Version V_5_5_0 = new Version(V_5_5_0_ID, org.apache.lucene.util.Version.LUCENE_6_6_0);
     public static final int V_5_6_0_ID = 5060099;
@@ -118,6 +120,8 @@ public static Version fromId(int id) {
                 return V_5_6_0;
             case V_5_5_0_ID:
                 return V_5_5_0;
+            case V_5_4_3_ID:
+                return V_5_4_3;
             case V_5_4_2_ID:
                 return V_5_4_2;
             case V_5_4_1_ID: