Fix broken test caused by setting old write index to read-only verifi…

…ed (elastic#123190)

elastic#122887 set read-only on the source indices of a data stream reindex. To test behavior when the source index was already read-only, testDataStreamUpgrade sometimes set the old write index to read-only. But the rest end point for adding a read-only block always sets verifed-read-only. This caused the old write index to not need to be upgraded, resulting in an incorrect value for total_indices_requiring_upgrade

muted-tests.yml

@@ -335,9 +335,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.CrossClusterAsyncQueryStopIT
   method: testStopQueryLocal
   issue: https://github.com/elastic/elasticsearch/issues/121672
-- class: org.elasticsearch.upgrades.DataStreamsUpgradeIT
-  method: testUpgradeDataStream
-  issue: https://github.com/elastic/elasticsearch/issues/123189
 - class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
   method: test {yaml=reference/snapshot-restore/restore-snapshot/line_408}
   issue: https://github.com/elastic/elasticsearch/issues/123192
@@ -348,6 +345,7 @@ tests:
   method: testHistoryIsWrittenWithFailure
   issue: https://github.com/elastic/elasticsearch/issues/123203
 
+
 # Examples:
 #
 #  Mute a single test case in a YAML test suite:

x-pack/qa/rolling-upgrade/src/test/java/org/elasticsearch/upgrades/DataStreamsUpgradeIT.java

@@ -548,9 +548,6 @@ private void upgradeDataStream(String dataStreamName, int numRolloversOnOldClust
             if (randomBoolean()) {
                 closeIndex(oldIndexName);
             }
-            if (randomBoolean()) {
-                assertOK(client().performRequest(new Request("PUT", oldIndexName + "/_block/read_only")));
-            }
         }
         Request reindexRequest = new Request("POST", "/_migration/reindex");
         reindexRequest.setJsonEntity(Strings.format("""