Remove test for lastest V6 since 'calculateNumRoutingShards' no longer needs version logic

Author: ielatif

server/src/test/java/org/elasticsearch/cluster/metadata/MetaDataCreateIndexServiceTests.java

@@ -433,12 +433,6 @@ public void testCalculateNumRoutingShards() {
         assertEquals(2048, MetaDataCreateIndexService.calculateNumRoutingShards(1024, Version.CURRENT));
         assertEquals(4096, MetaDataCreateIndexService.calculateNumRoutingShards(2048, Version.CURRENT));
 
-        Version latestV6 = VersionUtils.getPreviousVersion(Version.V_7_0_0);
-        int numShards = randomIntBetween(1, 1000);
-        assertEquals(numShards, MetaDataCreateIndexService.calculateNumRoutingShards(numShards, latestV6));
-        assertEquals(numShards, MetaDataCreateIndexService.calculateNumRoutingShards(numShards,
-            VersionUtils.randomVersionBetween(random(), VersionUtils.getFirstVersion(), latestV6)));
-
         for (int i = 0; i < 1000; i++) {
             int randomNumShards = randomIntBetween(1, 10000);
             int numRoutingShards = MetaDataCreateIndexService.calculateNumRoutingShards(randomNumShards, Version.CURRENT);