### Description

The [bootstrap checks docs for 8.1](https://github.com/elastic/elasticsearch/blob/8.1/docs/reference/setup/bootstrap-checks.asciidoc#system-call-filter-check) still have a [section for disabling system call filters](https://www.elastic.co/guide/en/elasticsearch/reference/8.1/_system_call_filter_check.html) even though that setting was removed in 8.0 (#72848) and its removal is [listed in the breaking changes](https://www.elastic.co/guide/en/elastic-stack/8.0/elasticsearch-breaking-changes.html)


server/src/test/java/org/elasticsearch/bootstrap/BootstrapChecksTests.java
),
            true,
            checks
        );
        final NodeValidationException e = expectThrows(
            NodeValidationException.class,
            () -> BootstrapChecks.check(zen2Context, true, checks)
        );
        assertThat(
            e,
            hasToString(
                containsString(
                    "the default discovery settings are unsuitable for production use; at least one "
                        + "of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured"
                )
            )
        );
        CheckedConsumer<Settings.Builder, NodeValidationException> ensureChecksPass = b -> {
            final BootstrapContext context = createTestContext(
                b.put(DiscoveryModule.DISCOVERY_TYPE_SETTING.getKey(), MULTI_NODE_DISCOVERY_TYPE).build(),
                Metadata.EMPTY_METADATA
            );
            BootstrapChecks.check(context, true, checks);
        };
        ensureChecksPass.accept(Settings.builder().putList(ClusterBootstrapService.INITIAL_MASTER_NODES_SETTING.getKey()));
        ensureChecksPass.accept(Settings.builder().putList(DiscoveryModule.DISCOVERY_SEED_PROVIDERS_SETTING.getKey()));
        ensureChecksPass.accept(Settings.builder().putList(SettingsBasedSeedHostsProvider.DISCOVERY_SEED_HOSTS_SETTING.getKey()));
    }
}