Add v1.2.3 to Version.java

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

@@ -184,6 +184,8 @@ public class Version implements Serializable {
     public static final Version V_1_2_1 = new Version(V_1_2_1_ID, false, org.apache.lucene.util.Version.LUCENE_4_8);
     public static final int V_1_2_2_ID = /*00*/1020299;
     public static final Version V_1_2_2 = new Version(V_1_2_2_ID, false, org.apache.lucene.util.Version.LUCENE_4_8);
+    public static final int V_1_2_3_ID = /*00*/1020399;
+    public static final Version V_1_2_3 = new Version(V_1_2_3_ID, false, org.apache.lucene.util.Version.LUCENE_4_8);
     public static final int V_1_3_0_ID = /*00*/1030099;
     public static final Version V_1_3_0 = new Version(V_1_3_0_ID, false, org.apache.lucene.util.Version.LUCENE_4_9);
     public static final int V_2_0_0_ID = /*00*/2000099;
@@ -205,6 +207,8 @@ public class Version implements Serializable {
                 return V_2_0_0;
             case V_1_3_0_ID:
                 return V_1_3_0;
+            case V_1_2_3_ID:
+                return V_1_2_3;
             case V_1_2_2_ID:
                 return V_1_2_2;
             case V_1_2_1_ID: