[7.x] Also expect RELOCATING in RecoveryIT.testRecoveryClosedIndex (#49090) (#49154)

In addition to the fix in #48506, it seems we could also get the
`RELOCATING` state.

This fixes the failure in
 https://gradle-enterprise.elastic.co/s/svjmmvqk32cii/tests/ua7icdau7nz6y-2cwvhj3qg5qou?openStackTraces=WzBd

Author: dimitris-athanasiou

qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/RecoveryIT.java

@@ -57,13 +57,13 @@
 import static org.elasticsearch.cluster.routing.UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING;
 import static org.elasticsearch.cluster.routing.allocation.decider.EnableAllocationDecider.INDEX_ROUTING_ALLOCATION_ENABLE_SETTING;
 import static org.elasticsearch.cluster.routing.allocation.decider.MaxRetryAllocationDecider.SETTING_ALLOCATION_MAX_RETRY;
-import static org.hamcrest.Matchers.either;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasSize;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.isIn;
 import static org.hamcrest.Matchers.notNullValue;
 import static org.hamcrest.Matchers.nullValue;
+import static org.hamcrest.Matchers.oneOf;
 
 /**
  * In depth testing of the recovery mechanism during a rolling restart.
@@ -597,7 +597,7 @@ private void assertClosedIndex(final String index, final boolean checkRoutingTab
                 for (Map<String, ?> shard : shards) {
                     assertThat(XContentMapValues.extractValue("shard", shard), equalTo(i));
                     assertThat((String) XContentMapValues.extractValue("state", shard),
-                        either(equalTo("STARTED")).or(equalTo("RELOCATED")));
+                        oneOf("STARTED", "RELOCATING", "RELOCATED"));
                     assertThat(XContentMapValues.extractValue("index", shard), equalTo(index));
                 }
             }