private ClusterControllerConfig createClusterControllerConfig(ModelElement contentElement,
                                                                      DeployState deployState,
                                                                      ContentCluster c,
                                                                      ClusterResourceLimits resourceLimits) {
            return new ClusterControllerConfig.Builder(c.clusterId,
                                                       contentElement,
                                                       resourceLimits.getClusterControllerLimits())
                    .build(deployState, c, contentElement.getXml());
        }
The admin model of this system or null if none (which only happens in tests)
config-model/src/main/java/com/yahoo/vespa/model/content/cluster/ContentCluster.java