Fix RepositoriesFileSettingsIT to wait for metadataVersion (elastic#126720) (elastic#126728)

Author: prdoyle

muted-tests.yml

@@ -284,9 +284,6 @@ tests:
 - class: org.elasticsearch.repositories.s3.RepositoryS3EcsCredentialsRestIT
   method: testNonexistentBucketReadonlyFalse
   issue: https://github.com/elastic/elasticsearch/issues/118225
-- class: org.elasticsearch.reservedstate.service.RepositoriesFileSettingsIT
-  method: testSettingsApplied
-  issue: https://github.com/elastic/elasticsearch/issues/116694
 - class: org.elasticsearch.discovery.ec2.DiscoveryEc2AvailabilityZoneAttributeNoImdsIT
   method: testAvailabilityZoneAttribute
   issue: https://github.com/elastic/elasticsearch/issues/118564

server/src/internalClusterTest/java/org/elasticsearch/reservedstate/service/RepositoriesFileSettingsIT.java

@@ -15,9 +15,11 @@
 import org.elasticsearch.action.admin.cluster.repositories.put.PutRepositoryRequest;
 import org.elasticsearch.action.admin.cluster.repositories.put.TransportPutRepositoryAction;
 import org.elasticsearch.action.admin.cluster.repositories.reservedstate.ReservedRepositoryAction;
+import org.elasticsearch.action.admin.cluster.state.ClusterStateRequest;
 import org.elasticsearch.client.internal.Client;
 import org.elasticsearch.cluster.ClusterChangedEvent;
 import org.elasticsearch.cluster.ClusterStateListener;
+import org.elasticsearch.cluster.metadata.RepositoryMetadata;
 import org.elasticsearch.cluster.metadata.ReservedStateErrorMetadata;
 import org.elasticsearch.cluster.metadata.ReservedStateHandlerMetadata;
 import org.elasticsearch.cluster.metadata.ReservedStateMetadata;
@@ -129,13 +131,15 @@ private void assertClusterStateSaveOK(CountDownLatch savedClusterState, AtomicLo
         boolean awaitSuccessful = savedClusterState.await(20, TimeUnit.SECONDS);
         assertTrue(awaitSuccessful);
 
+        clusterAdmin().state(new ClusterStateRequest(TEST_REQUEST_TIMEOUT).waitForMetadataVersion(metadataVersion.get())).get();
+
         final var reposResponse = client().execute(
             GetRepositoriesAction.INSTANCE,
             new GetRepositoriesRequest(TEST_REQUEST_TIMEOUT, new String[] { "repo", "repo1" })
         ).get();
 
         assertThat(
-            reposResponse.repositories().stream().map(r -> r.name()).collect(Collectors.toSet()),
+            reposResponse.repositories().stream().map(RepositoryMetadata::name).collect(Collectors.toSet()),
             containsInAnyOrder("repo", "repo1")
         );