### CI Link

https://gradle-enterprise.elastic.co/s/oyi6h23yl6k3o/tests/:x-pack:qa:full-cluster-restart:v8.11.0%23bwcTest/org.elasticsearch.xpack.restart.CoreFullClusterRestartIT/testClusterState%20%7Bcluster=OLD%7D

### Repro line

./gradlew ':qa:full-cluster-restart:v8.11.0#bwcTest' -Dtests.class="org.elasticsearch.upgrades.FullClusterRestartIT"

### Does it reproduce?

Yes

### Applicable branches

main

### Failure history

_No response_

### Failure excerpt

This test assumes that the index created version in cluster state matches the old node version.

That is no longer true due to the introduction of `IndexVersion`

https://github.com/elastic/elasticsearch/blob/52a6820813577abcb23191d862a01e32e652ed42/qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/FullClusterRestartIT.java#L435-L440
qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/FullClusterRestartIT.java
}
            }
        } else {
            ensureGreen(index);
            flush(index, true);
            assertEmptyTranslog(index);
            ensurePeerRecoveryRetentionLeasesRenewedAndSynced(index);
        }
    }
    public void testResize() throws Exception {
        int numDocs;
        if (isRunningAgainstOldCluster()) {
            final Settings.Builder settings = Settings.builder()
                .put(IndexMetadata.INDEX_NUMBER_OF_SHARDS_SETTING.getKey(), 3)
                .put(IndexMetadata.INDEX_NUMBER_OF_REPLICAS_SETTING.getKey(), 1);
            if (minimumNodeVersion().before(Version.V_8_0_0) && randomBoolean()) {
                settings.put(IndexSettings.INDEX_SOFT_DELETES_SETTING.getKey(), false);
            }
            final String mappings = randomBoolean() ? "\"_source\": { \"enabled\": false}" : null;
            createIndex(index, settings.build(), mappings);
            numDocs = randomIntBetween(10, 1000);
            for (int i = 0; i < numDocs; i++) {
                indexDocument(Integer.toString(i));
                if (rarely()) {
                    flush(index, randomBoolean());
                }
            }
            saveInfoDocument("num_doc_" + index, Integer.toString(numDocs));
            ensureGreen(index);
        } else {