Fix OldRepositoryAccessIT testOldRepoAccess (#117649)

This test started failing with the changes made in #115314 when
we only have one shard in the index. This change adjusts test expectations.

Closes #115631

Author: cbuescher

muted-tests.yml

@@ -91,9 +91,6 @@ tests:
 - class: org.elasticsearch.xpack.restart.MLModelDeploymentFullClusterRestartIT
   method: testDeploymentSurvivesRestart {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/115528
-- class: org.elasticsearch.oldrepos.OldRepositoryAccessIT
-  method: testOldRepoAccess
-  issue: https://github.com/elastic/elasticsearch/issues/115631
 - class: org.elasticsearch.action.update.UpdateResponseTests
   method: testToAndFromXContent
   issue: https://github.com/elastic/elasticsearch/issues/115689

x-pack/qa/repository-old-versions/src/test/java/org/elasticsearch/oldrepos/OldRepositoryAccessIT.java

@@ -484,7 +484,8 @@ private void assertDocs(
                 logger.info(searchResponse);
                 assertEquals(0, searchResponse.getHits().getTotalHits().value());
                 assertEquals(numberOfShards, searchResponse.getSuccessfulShards());
-                assertEquals(numberOfShards, searchResponse.getSkippedShards());
+                int expectedSkips = numberOfShards == 1 ? 0 : numberOfShards;
+                assertEquals(expectedSkips, searchResponse.getSkippedShards());
             } finally {
                 searchResponse.decRef();
             }