### 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
example.mapping.accept(b);
                b.field("ignore_malformed", false);
            }, example.value, example.exceptionMessageMatcher);
        }
    }
    private void assertIgnoreMalformedFalse(
        CheckedConsumer<XContentBuilder, IOException> mapping,
        CheckedConsumer<XContentBuilder, IOException> value,
        Matcher<String> exceptionMessageMatcher
    ) throws IOException {
        MapperService mapperService = createMapperService(fieldMapping(mapping));
        FieldMapper mapper = (FieldMapper) mapperService.documentMapper().mappers().getMapper("field");
        assertFalse(mapper.ignoreMalformed());
        SourceToParse source = source(b -> {
            b.field("field");
            value.accept(b);
        });
        MapperParsingException e = expectThrows(MapperParsingException.class, () -> mapperService.documentMapper().parse(source));
        assertThat(
            "incorrect exception while parsing " + source.source().utf8ToString(),
            e.getCause().getMessage(),
            exceptionMessageMatcher
        );
    }
    public final void testIgnoreMalformedTrue() throws IOException {
        if (false == supportsIgnoreMalformed()) {
            Exception e = expectThrows(MapperParsingException.class, () -> createMapperService(fieldMapping(b -> {
                minimalMapping(b);
                b.field("ignore_malformed", true);
            })));