### 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_
x-pack/plugin/mapper-aggregate-metric/src/main/java/org/elasticsearch/xpack/aggregatemetric/mapper/AggregateDoubleMetricFieldMapper.java
public LeafAggregateDoubleMetricFieldData loadDirect(LeafReaderContext context) {
                    return load(context);
                }
                @Override
                public SortField sortField(
                    Object missingValue,
                    MultiValueMode sortMode,
                    XFieldComparatorSource.Nested nested,
                    boolean reverse
                ) {
                    return new SortedNumericSortField(delegateFieldType().name(), SortField.Type.DOUBLE, reverse);
                }
                @Override
                public BucketedSort newBucketedSort(
                    BigArrays bigArrays,
                    Object missingValue,
                    MultiValueMode sortMode,
                    XFieldComparatorSource.Nested nested,
                    SortOrder sortOrder,
                    DocValueFormat format,
                    int bucketSize,
                    BucketedSort.ExtraData extra
                ) {
                    throw new IllegalArgumentException("Can't sort on the [" + CONTENT_TYPE + "] field");
                }
            };
        }
        @Override
        public ValueFetcher valueFetcher(SearchExecutionContext context, String format) {
            return SourceValueFetcher.identity(name(), context, format);