Today submitting an unbatched `ClusterStateUpdateTask` to the `MasterService` is deprecated, and devs are encouraged to write their own batching executor instead. In principle this makes it possible to combine updates without incurring the costs of building a whole new `ClusterState` on each iteration, but in practice most implementations don't work at a lower level and just iteratively update a `ClusterState`. Moreover creating new `ClusterState` instances is nothing like as expensive as once it was.

We should accept this and provide some friendlier utilities for writing batched cluster state updates, ideally leaving the developer to express the desired per-task update as a `ClusterState -> ClusterState` operator.
server/src/main/java/org/elasticsearch/cluster/metadata/MetadataIndexTemplateService.java
Locale.ROOT,
                "index template [%s] has index patterns %s matching patterns from "
                    + "existing templates [%s] with patterns (%s) that have the same priority [%d], multiple index templates may not "
                    + "match during index creation, please use a different priority",
                name,
                template.indexPatterns(),
                Strings.collectionToCommaDelimitedString(overlaps.keySet()),
                overlaps.entrySet().stream().map(e -> e.getKey() + " => " + e.getValue()).collect(Collectors.joining(",")),
                template.priorityOrZero()
            );
            throw new IllegalArgumentException(error);
        }
        overlaps = findConflictingV1Templates(currentState, name, template.indexPatterns());
        if (overlaps.size() > 0) {
            String warning = String.format(
                Locale.ROOT,
                "index template [%s] has index patterns %s matching patterns from "
                    + "existing older templates [%s] with patterns (%s); this template [%s] will take precedence during new index creation",
                name,
                template.indexPatterns(),
                Strings.collectionToCommaDelimitedString(overlaps.keySet()),
                overlaps.entrySet().stream().map(e -> e.getKey() + " => " + e.getValue()).collect(Collectors.joining(",")),
                name
            );
            logger.warn(warning);
            HeaderWarning.addWarning(warning);
        }
        ComposableIndexTemplate finalIndexTemplate = template;
        Template innerTemplate = template.template();
        if (innerTemplate != null) {