enable rebalance

Author: ywangd

server/src/internalClusterTest/java/org/elasticsearch/snapshots/SnapshotStressTestsIT.java

@@ -34,6 +34,7 @@
 import org.elasticsearch.cluster.metadata.SingleNodeShutdownMetadata;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.cluster.node.DiscoveryNodes;
+import org.elasticsearch.cluster.routing.allocation.decider.EnableAllocationDecider;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.Priority;
 import org.elasticsearch.common.Randomness;
@@ -104,6 +105,7 @@ public void testRandomActivities() throws InterruptedException {
     protected Settings nodeSettings(int nodeOrdinal, Settings otherSettings) {
         return Settings.builder()
             .put(super.nodeSettings(nodeOrdinal, otherSettings))
+            .put(EnableAllocationDecider.CLUSTER_ROUTING_REBALANCE_ENABLE_SETTING.getKey(), EnableAllocationDecider.Rebalance.ALL)
             .put(SnapshotsService.SHARD_SNAPSHOT_PER_NODE_LIMIT_SETTING.getKey(), 5) // more aggressive limit
             .build();
     }