private void buildSearchCluster(DeployState deployState, ModelElement clusterElem,
                                        String clusterName, ContentSearchCluster search) {
            ModelElement docElem = clusterElem.child("documents");
            if (docElem == null) return;

            Double visibilityDelay = clusterElem.childAsDouble("engine.proton.visibility-delay");
            if (visibilityDelay != null) {
                search.setVisibilityDelay(visibilityDelay);
            }

            var isc = new IndexedSearchCluster(search, clusterName, search, deployState.featureFlags());
            search.addSearchCluster(deployState, isc, getQueryTimeout(clusterElem), docElem.subElements("document"));
        }
Whether the nodes of this cluster also hosts a container cluster in a hosted system
config-model/src/main/java/com/yahoo/vespa/model/content/ContentSearchCluster.java