### 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
}
        fieldType().type.addFields(context.doc(), fieldType().name(), numericValue, indexed, hasDocValues, stored);
        if (false == allowMultipleValues && (indexed || hasDocValues || stored)) {
            
            List<IndexableField> fields = context.doc().getFields();
            IndexableField last = fields.get(fields.size() - 1);
            assert last.name().equals(fieldType().name())
                : "last field name [" + last.name() + "] mis match field name [" + fieldType().name() + "]";
            context.doc().onlyAddKey(fieldType().name(), fields.get(fields.size() - 1));
        }
        if (hasDocValues == false && (stored || indexed)) {
            context.addToFieldNames(fieldType().name());
        }
    }
    @Override
    protected void indexScriptValues(
        SearchLookup searchLookup,
        LeafReaderContext readerContext,
        int doc,
        DocumentParserContext documentParserContext
    ) {
        this.scriptValues.valuesForDoc(searchLookup, readerContext, doc, value -> indexValue(documentParserContext, value));
    }
    @Override
    public FieldMapper.Builder getMergeBuilder() {
        return new Builder(simpleName(), type, scriptCompiler, ignoreMalformedByDefault, coerceByDefault, indexCreatedVersion).dimension(
            dimension
        ).metric(metricType).allowMultipleValues(allowMultipleValues).init(this);
    }
    @Override