public ApplicationReindexing without(String cluster, String documentType) {
        Cluster current = clusters.get(cluster);
        if (current == null)
            return this;

        Cluster modified = new Cluster(current.pending,
                                       without(documentType, current.ready));
        return new ApplicationReindexing(enabled, with(cluster, modified, clusters));
    }
Returns a copy of this without the given document type in the given cluster.
configserver/src/main/java/com/yahoo/vespa/config/server/application/ApplicationReindexing.java