Add version 6.5.3 to 6.x branch (#36267)

Author: jaymode

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

@@ -192,6 +192,8 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_5_1 = new Version(V_6_5_1_ID, org.apache.lucene.util.Version.LUCENE_7_5_0);
     public static final int V_6_5_2_ID = 6050299;
     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_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);
 
@@ -210,6 +212,8 @@ public static Version fromId(int id) {
         switch (id) {
             case V_6_6_0_ID:
                 return V_6_6_0;
+            case V_6_5_3_ID:
+                return V_6_5_3;
             case V_6_5_2_ID:
                 return V_6_5_2;
             case V_6_5_1_ID: