### 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 static final String CONTENT_TYPE = "aggregate_metric_double";
    public static final String SUBFIELD_SEPARATOR = ".";
    private static AggregateDoubleMetricFieldMapper toType(FieldMapper in) {
        return (AggregateDoubleMetricFieldMapper) in;
    }
    /**
     * Return the name of a subfield of an aggregate metric field
     *
     * @param fieldName the name of the aggregate metric field
     * @param metric    the metric type the subfield corresponds to
     * @return the name of the subfield
     */
    public static String subfieldName(String fieldName, Metric metric) {
        return fieldName + AggregateDoubleMetricFieldMapper.SUBFIELD_SEPARATOR + metric.name();
    }
    /**
     * Mapping field names
     */
    public static class Names {