Fixes the Version constants for 5.2.0, 5.2.1, and 5.3.0 to

have the correct Lucene version (6.4.0)

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

@@ -107,9 +107,9 @@ public class Version implements Comparable<Version> {
     public static final int V_5_1_3_ID_UNRELEASED = 5010399;
     public static final Version V_5_1_3_UNRELEASED = new Version(V_5_1_3_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
     public static final int V_5_2_0_ID_UNRELEASED = 5020099;
-    public static final Version V_5_2_0_UNRELEASED = new Version(V_5_2_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
+    public static final Version V_5_2_0_UNRELEASED = new Version(V_5_2_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
     public static final int V_5_2_1_ID_UNRELEASED = 5020199;
-    public static final Version V_5_2_1_UNRELEASED = new Version(V_5_2_1_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_3_0);
+    public static final Version V_5_2_1_UNRELEASED = new Version(V_5_2_1_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
     public static final int V_5_3_0_ID_UNRELEASED = 5030099;
     public static final Version V_5_3_0_UNRELEASED = new Version(V_5_3_0_ID_UNRELEASED, org.apache.lucene.util.Version.LUCENE_6_4_0);
     public static final int V_6_0_0_alpha1_ID_UNRELEASED = 6000001;

core/src/test/java/org/elasticsearch/bwcompat/OldIndexBackwardsCompatibilityIT.java

@@ -206,7 +206,6 @@ public class OldIndexBackwardsCompatibilityIT extends ESIntegTestCase {
         }
     }
 
-    @AwaitsFix(bugUrl = "")
     public void testOldIndexes() throws Exception {
         setupCluster();