### Elasticsearch Version

main

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

all

### Problem Description

When you configure an `aggregate_metric_double` with `ignore_malformed: true` and send a malformed value we create an `_ignored` field with three values, `field.value_count`, `field.min`, and `field.max`. This is the only top "composite" field that creates `_ignored` values for its children. Things like shape only create `field` in `_ignored`. Is there a good reason for `aggregate_metric_double` to be different?

### Steps to Reproduce

see above

### Logs (if relevant)

_No response_
test/framework/src/main/java/org/elasticsearch/index/mapper/MapperTestCase.java
fdt
            )
        );
        ValueFetcher nativeFetcher = ft.valueFetcher(searchExecutionContext, format);
        ParsedDocument doc = mapperService.documentMapper().parse(source);
        withLuceneIndex(mapperService, iw -> iw.addDocuments(doc.docs()), ir -> {
            SourceLookup sourceLookup = new SourceLookup(new SourceLookup.ReaderSourceProvider());
            sourceLookup.setSegmentAndDocument(ir.leaves().get(0), 0);
            docValueFetcher.setNextReader(ir.leaves().get(0));
            nativeFetcher.setNextReader(ir.leaves().get(0));
            List<Object> fromDocValues = docValueFetcher.fetchValues(sourceLookup, 0, new ArrayList<>());
            List<Object> fromNative = nativeFetcher.fetchValues(sourceLookup, 0, new ArrayList<>());
            /*
             * The native fetcher uses byte, short, etc but doc values always
             * uses long or double. This difference is fine because on the outside
             * users can't see it.
             */
            fromNative = fromNative.stream().map(o -> {
                if (o instanceof Integer || o instanceof Short || o instanceof Byte) {
                    return ((Number) o).longValue();
                }
                if (o instanceof Float) {
                    return ((Float) o).doubleValue();
                }
                return o;
            }).collect(toList());
            if (dedupAfterFetch()) {
                fromNative = fromNative.stream().distinct().collect(Collectors.toList());
            }
            /*