### 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
);
        assertEquals(-10.1, doc.rootDoc().getField("field.min").numericValue());
        Mapper fieldMapper = mapper.mappers().getMapper("field");
        assertThat(fieldMapper, instanceOf(AggregateDoubleMetricFieldMapper.class));
    }
    /**
     * Test that invalid field mapping containing no metrics is not accepted
     */
    public void testInvalidMapping() throws Exception {
        XContentBuilder mapping = XContentFactory.jsonBuilder()
            .startObject()
            .startObject("_doc")
            .startObject("properties")
            .startObject("metric")
            .field("type", CONTENT_TYPE)
            .endObject()
            .endObject()
            .endObject()
            .endObject();
        Exception e = expectThrows(MapperParsingException.class, () -> createDocumentMapper(mapping));
        assertThat(e.getMessage(), containsString("Property [metrics] is required for field [metric]."));
    }
    /**
     * Test parsing an aggregate_metric field that contains no values
     */
    public void testParseEmptyValue() throws Exception {
        DocumentMapper mapper = createDocumentMapper(fieldMapping(this::minimalMapping));
        Exception e = expectThrows(MapperParsingException.class, () -> mapper.parse(source(b -> b.startObject("field").endObject())));
        assertThat(
            e.getCause().getMessage(),