### 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_
server/src/main/java/org/elasticsearch/index/mapper/NumberFieldMapper.java
@Override
        public Object valueForDisplay(Object value) {
            if (value == null) {
                return null;
            }
            return type.valueForSearch((Number) value);
        }
        @Override
        public ValueFetcher valueFetcher(SearchExecutionContext context, String format) {
            if (format != null) {
                throw new IllegalArgumentException("Field [" + name() + "] of type [" + typeName() + "] doesn't support formats.");
            }
            if (this.scriptValues != null) {
                return FieldValues.valueFetcher(this.scriptValues, context);
            }
            return sourceValueFetcher(context.isSourceEnabled() ? context.sourcePath(name()) : Collections.emptySet());
        }
        private SourceValueFetcher sourceValueFetcher(Set<String> sourcePaths) {
            return new SourceValueFetcher(sourcePaths, nullValue) {
                @Override
                protected Object parseSourceValue(Object value) {
                    if (value.equals("")) {
                        return nullValue;
                    }
                    return type.parse(value, coerce);
                }
            };
        }
        @Override
        public DocValueFormat docValueFormat(String format, ZoneId timeZone) {