### 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
assertThat(e.getMessage(), containsString("unknown parameter [ignore_malformed] on mapper [field]"));
            return;
        }
        for (ExampleMalformedValue example : exampleMalformedValues()) {
            XContentBuilder mapping = fieldMapping(b -> {
                example.mapping.accept(b);
                b.field("ignore_malformed", true);
            });
            MapperService mapperService = createMapperService(mapping);
            FieldMapper mapper = (FieldMapper) mapperService.documentMapper().mappers().getMapper("field");
            assertTrue(mapper.ignoreMalformed());
            ParsedDocument doc = mapperService.documentMapper().parse(source(b -> {
                b.field("field");
                example.value.accept(b);
            }));
            IndexableField[] fields = doc.rootDoc().getFields("field");
            assertThat(fields, equalTo(new IndexableField[0]));
            assertThat(TermVectorsService.getValues(doc.rootDoc().getFields("_ignored")), equalTo(ignoredFields()));
        }
    }
    /**
     * The field names that are saved in {@code _ignored} when ignoring a malformed value.
     */
    protected String[] ignoredFields() {
        return new String[] { "field" };
    }
    protected void assertExistsQuery(MapperService mapperService) throws IOException {
        LuceneDocument fields = mapperService.documentMapper().parse(source(this::writeField)).rootDoc();
        SearchExecutionContext searchExecutionContext = createSearchExecutionContext(mapperService);
        MappedFieldType fieldType = mapperService.fieldType("field");