public ClusterState measureAllocation() {
        ClusterState clusterState = initialClusterState;
        while (clusterState.getRoutingNodes().hasUnassignedShards()) {
            clusterState = strategy.applyStartedShards(
                clusterState,
                clusterState.getRoutingNodes().shardsWithState(ShardRoutingState.INITIALIZING)
            );
            clusterState = strategy.reroute(clusterState, "reroute");