### CI Link

https://gradle-enterprise.elastic.co/s/7dleq35dp5stm

### Repro line

./gradlew ':x-pack:plugin:core:test' --tests "org.elasticsearch.xpack.core.ilm.SetSingleNodeAllocateStepTests.testPerformActionAttrsRequestFails" -Dtests.seed=6B438F3C3DADE5D2 -Dtests.locale=nl -Dtests.timezone=Asia/Chongqin

### Does it reproduce?

Yes

### Applicable branches

8.1, 8.0

### Failure history

Seems to fail rarely, but has failed before. Example: https://gradle-enterprise.elastic.co/s/d33b4fzn7yoh6

### Failure excerpt

```
org.elasticsearch.xpack.core.ilm.SetSingleNodeAllocateStepTests > testPerformActionAttrsRequestFails FAILED
    java.lang.AssertionError: Node roles must not be provided as attributes but saw attributes {ml=K}
        at __randomizedtesting.SeedInfo.seed([C679BACC1DA27FA7:CB16887322D9C088]:0)
        at org.elasticsearch.cluster.node.DiscoveryNode.<init>(DiscoveryNode.java:233)
        at org.elasticsearch.cluster.node.DiscoveryNode.<init>(DiscoveryNode.java:175)
```
x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ilm/SetSingleNodeAllocateStepTests.java
} else {
                nodeSettingsBuilder.put(invalidNodeSettings).put(Node.NODE_NAME_SETTING.getKey(), nodeName);
            }
            nodes.add(
                DiscoveryNode.createLocal(
                    nodeSettingsBuilder.build(),
                    new TransportAddress(TransportAddress.META_ADDRESS, nodePort),
                    nodeId
                )
            );
        }
        assertNodeSelected(indexMetadata, index, validNodeIds, nodes);
    }
    public void testPerformActionWithClusterExcludeFilters() throws IOException {
        Settings.Builder indexSettings = settings(Version.CURRENT);
        IndexMetadata indexMetadata = IndexMetadata.builder(randomAlphaOfLength(10))
            .settings(indexSettings)
            .numberOfShards(randomIntBetween(1, 5))
            .numberOfReplicas(randomIntBetween(0, 1))
            .build();
        Index index = indexMetadata.getIndex();
        DiscoveryNodes.Builder nodes = DiscoveryNodes.builder();
        String nodeId = "node_id_0";
        int nodePort = 9300;
        Builder nodeSettingsBuilder = Settings.builder();
        nodes.add(
            DiscoveryNode.createLocal(nodeSettingsBuilder.build(), new TransportAddress(TransportAddress.META_ADDRESS, nodePort), nodeId)
        );
        Settings clusterSettings = Settings.builder().put("cluster.routing.allocation.exclude._id", "node_id_0").build();
        ImmutableOpenMap.Builder<String, IndexMetadata> indices = ImmutableOpenMap.<String, IndexMetadata>builder()