https://github.com/elastic/elasticsearch/pull/97304 removes several places that might do an expensive rebuild of the cluster state via `getStateForMasterService`. There's one other call we should be able to remove, in `JoinValidationService`, but it's a little tricky since we rely on seeing the last-accepted state for the cluster UUID validation, and it's not obviously ok to expose the last-accepted state without the no-master block.

This is a fairly minor issue because we do not do this join validation during elections, only if we're the elected master, and in that case `getStateForMasterService` is cheap. But that's not guaranteed, and we should strengthen this to avoid the that expensive step whenever possible.
server/src/main/java/org/elasticsearch/cluster/coordination/Coordinator.java
this::removeNode,
            nodeHealthService
        );
        this.nodeLeftQueue = masterService.createTaskQueue("node-left", Priority.IMMEDIATE, new NodeLeftExecutor(allocationService));
        this.clusterApplier = clusterApplier;
        masterService.setClusterStateSupplier(this::getStateForMasterService);
        this.reconfigurator = reconfigurator;
        this.clusterBootstrapService = new ClusterBootstrapService(
            settings,
            transportService,
            this::getFoundPeers,
            this::isInitialConfigurationSet,
            this::setInitialConfiguration
        );
        this.lagDetector = new LagDetector(
            settings,
            transportService.getThreadPool(),
            new LagDetector.HotThreadsLoggingLagListener(
                transportService,
                client,
                (node, appliedVersion, expectedVersion) -> removeNode(node, "lagging")
            ),
            transportService::getLocalNode
        );
        this.clusterFormationFailureHelper = new ClusterFormationFailureHelper(
            settings,
            this::getClusterFormationState,
            transportService.getThreadPool(),
            joinHelper::logLastFailedJoinAttempt
        );