### 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/test/java/org/elasticsearch/xpack/aggregatemetric/mapper/AggregateDoubleMetricFieldMapperTests.java
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.LuceneDocument;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.Mapper;
import org.elasticsearch.index.mapper.MapperParsingException;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.MapperTestCase;
import org.elasticsearch.index.mapper.ParsedDocument;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentFactory;
import org.elasticsearch.xpack.aggregatemetric.AggregateMetricMapperPlugin;
import org.elasticsearch.xpack.aggregatemetric.mapper.AggregateDoubleMetricFieldMapper.Metric;
import org.hamcrest.Matchers;
import org.junit.AssumptionViolatedException;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import static org.elasticsearch.xpack.aggregatemetric.mapper.AggregateDoubleMetricFieldMapper.Names.METRICS;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.matchesPattern;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.core.IsInstanceOf.instanceOf;
public class AggregateDoubleMetricFieldMapperTests extends MapperTestCase {