added 6.5.4 and 5.6.15 versions

Author: martijnvg

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

@@ -130,6 +130,8 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_5_6_13 = new Version(V_5_6_13_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
     public static final int V_5_6_14_ID = 5061499;
     public static final Version V_5_6_14 = new Version(V_5_6_14_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
+    public static final int V_5_6_15_ID = 5061599;
+    public static final Version V_5_6_15 = new Version(V_5_6_15_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
     public static final int V_6_0_0_alpha1_ID = 6000001;
     public static final Version V_6_0_0_alpha1 = new Version(V_6_0_0_alpha1_ID, org.apache.lucene.util.Version.LUCENE_7_0_0);
     public static final int V_6_0_0_alpha2_ID = 6000002;
@@ -194,6 +196,8 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_5_2 = new Version(V_6_5_2_ID, org.apache.lucene.util.Version.LUCENE_7_5_0);
     public static final int V_6_5_3_ID = 6050399;
     public static final Version V_6_5_3 = new Version(V_6_5_3_ID, org.apache.lucene.util.Version.LUCENE_7_5_0);
+    public static final int V_6_5_4_ID = 6050499;
+    public static final Version V_6_5_4 = new Version(V_6_5_4_ID, org.apache.lucene.util.Version.LUCENE_7_5_0);
     public static final int V_6_6_0_ID = 6060099;
     public static final Version V_6_6_0 = new Version(V_6_6_0_ID, org.apache.lucene.util.Version.LUCENE_7_6_0);
 
@@ -212,6 +216,8 @@ public static Version fromId(int id) {
         switch (id) {
             case V_6_6_0_ID:
                 return V_6_6_0;
+            case V_6_5_4_ID:
+                return V_6_5_4;
             case V_6_5_3_ID:
                 return V_6_5_3;
             case V_6_5_2_ID:
@@ -270,6 +276,8 @@ public static Version fromId(int id) {
                 return V_6_0_0_alpha2;
             case V_6_0_0_alpha1_ID:
                 return V_6_0_0_alpha1;
+            case V_5_6_15_ID:
+                return V_5_6_15;
             case V_5_6_14_ID:
                 return V_5_6_14;
             case V_5_6_13_ID: