### 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
/**
         * Match the error message in an arbitrary way.
         */
        public ExampleMalformedValue errorMatches(Matcher<String> newMatcher) {
            return new ExampleMalformedValue(mapping, value, newMatcher);
        }
    }
    /**
     * Some example of malformed values and matches for exceptions that parsing them should create.
     */
    protected List<ExampleMalformedValue> exampleMalformedValues() {
        assertFalse("mappers that support ignore_malformed values most override exampleMalformedValues", supportsIgnoreMalformed());
        return List.of();
    }
    public final void testIgnoreMalformedFalseByDefault() throws IOException {
        for (ExampleMalformedValue example : exampleMalformedValues()) {
            assertIgnoreMalformedFalse(example.mapping, example.value, example.exceptionMessageMatcher);
        }
    }
    public final void testIgnoreMalformedExplicitlyFalse() throws IOException {
        if (false == supportsIgnoreMalformed()) {
            Exception e = expectThrows(MapperParsingException.class, () -> createMapperService(fieldMapping(b -> {
                minimalMapping(b);
                b.field("ignore_malformed", false);
            })));
            assertThat(e.getMessage(), containsString("unknown parameter [ignore_malformed] on mapper [field]"));
            return;
        }
        for (ExampleMalformedValue example : exampleMalformedValues()) {
            assertIgnoreMalformedFalse(b -> {