Allow old balancer until V10 (#113469)

While setting the balancer/allocation type is still deprecated,
we are not going to remove it until next major.

Author: henningandersen

server/src/main/java/org/elasticsearch/cluster/ClusterModule.java

@@ -67,7 +67,7 @@
 import org.elasticsearch.common.settings.Setting;
 import org.elasticsearch.common.settings.Setting.Property;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.core.UpdateForV9;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.gateway.GatewayAllocator;
 import org.elasticsearch.health.metadata.HealthMetadataService;
 import org.elasticsearch.health.node.selection.HealthNodeTaskExecutor;
@@ -391,7 +391,7 @@ private static void addAllocationDecider(Map<Class<?>, AllocationDecider> decide
         }
     }
 
-    @UpdateForV9 // in v9 there is only one allocator
+    @UpdateForV10 // in v10 there is only one allocator
     private static ShardsAllocator createShardsAllocator(
         Settings settings,
         ClusterSettings clusterSettings,