### 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
return this;
        }
        @Override
        public AggregateDoubleMetricFieldMapper build(MapperBuilderContext context) {
            if (defaultMetric.isConfigured() == false) {
                
                if (metrics.getValue().size() == 1) {
                    Metric m = metrics.getValue().iterator().next();
                    defaultMetric.setValue(m);
                }
                if (metrics.getValue().contains(defaultMetric.getValue()) == false) {
                    throw new IllegalArgumentException("Property [" + Names.DEFAULT_METRIC + "] is required for field [" + name() + "].");
                }
            }
            if (metrics.getValue().contains(defaultMetric.getValue()) == false) {
                
                throw new IllegalArgumentException(
                    "Default metric [" + defaultMetric.getValue() + "] is not defined in the metrics of field [" + name() + "]."
                );
            }
            EnumMap<Metric, NumberFieldMapper> metricMappers = new EnumMap<>(Metric.class);
            
            for (Metric m : this.metrics.getValue()) {
                String fieldName = subfieldName(name, m);
                NumberFieldMapper.Builder builder;
                if (m == Metric.value_count) {
                    
                    builder = new NumberFieldMapper.Builder(
                        fieldName,
                        NumberFieldMapper.NumberType.INTEGER,