public void getConfig(ClusterConfig.Builder builder) {
        builder.clusterName(getClusterName());
        builder.storageRoute(getClusterName());
        builder.configid(getConfigId());
        if (visibilityDelay != null) {
            builder.cacheTimeout(convertVisibilityDelay(visibilityDelay));
        }
        if (hasStreaming()) {
            builder.indexMode(ClusterConfig.IndexMode.Enum.STREAMING);
        } else {
            builder.indexMode(ClusterConfig.IndexMode.Enum.INDEX);
        }
    }
Returns the document databases contained in this cluster
config-model/src/main/java/com/yahoo/vespa/model/search/SearchCluster.java