Add Elasticsaerch version 5.6.13 (elastic#33838)

Author: polyfractal

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

@@ -126,6 +126,8 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_5_6_11 = new Version(V_5_6_11_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
     public static final int V_5_6_12_ID = 5061299;
     public static final Version V_5_6_12 = new Version(V_5_6_12_ID, org.apache.lucene.util.Version.LUCENE_6_6_1);
+    public static final int V_5_6_13_ID = 5061399;
+    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_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;
@@ -246,6 +248,8 @@ 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_13_ID:
+                return V_5_6_13;
             case V_5_6_12_ID:
                 return V_5_6_12;
             case V_5_6_11_ID: