Remove deprecated method usage

Author: jbaiera

x-pack/plugin/ilm/src/main/java/org/elasticsearch/xpack/ilm/PutLifecycleMetadataService.java

@@ -154,7 +154,7 @@ private static void validatePrerequisites(LifecyclePolicy policy, ProjectState s
         for (Phase phase : phasesWithSearchableSnapshotActions) {
             SearchableSnapshotAction action = (SearchableSnapshotAction) phase.getActions().get(SearchableSnapshotAction.NAME);
             String repository = action.getSnapshotRepository();
-            if (RepositoriesMetadata.get(state.cluster()).repository(repository) == null) {
+            if (RepositoriesMetadata.get(state.metadata()).repository(repository) == null) {
                 throw new IllegalArgumentException(
                     "no such repository ["
                         + repository