### 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_
test/framework/src/main/java/org/elasticsearch/index/mapper/MapperTestCase.java
final XContentBuilder init;
        final XContentBuilder update;
        final Consumer<FieldMapper> check;
        private UpdateCheck(CheckedConsumer<XContentBuilder, IOException> update, Consumer<FieldMapper> check) throws IOException {
            this.init = fieldMapping(MapperTestCase.this::minimalMapping);
            this.update = fieldMapping(b -> {
                minimalMapping(b);
                update.accept(b);
            });
            this.check = check;
        }
        private UpdateCheck(
            CheckedConsumer<XContentBuilder, IOException> init,
            CheckedConsumer<XContentBuilder, IOException> update,
            Consumer<FieldMapper> check
        ) throws IOException {
            this.init = fieldMapping(init);
            this.update = fieldMapping(update);
            this.check = check;
        }
    }
    private record ConflictCheck(XContentBuilder init, XContentBuilder update) {}
    public class ParameterChecker {