### 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
* for query time scripts and index time scripts
     */
    public final void testIndexTimeStoredFieldsAccess() throws IOException {
        assumeTrue("Field type does not support stored fields", supportsStoredFields());
        MapperService mapperService = createMapperService(fieldMapping(this::minimalStoreMapping));
        assertParseMinimalWarnings();
        MappedFieldType fieldType = mapperService.fieldType("field");
        SourceToParse source = source(this::writeField);
        ParsedDocument doc = mapperService.documentMapper().parse(source);
        SearchLookup lookup = new SearchLookup(
            f -> fieldType,
            (f, s, t) -> { throw new UnsupportedOperationException(); },
            new SourceLookup.ReaderSourceProvider()
        );
        withLuceneIndex(mapperService, iw -> iw.addDocument(doc.rootDoc()), ir -> {
            LeafReaderContext ctx = ir.leaves().get(0);
            LeafStoredFieldsLookup storedFields = lookup.getLeafSearchLookup(ctx).fields();
            storedFields.setDocument(0);
            DocumentLeafReader reader = new DocumentLeafReader(doc.rootDoc(), Collections.emptyMap());
            LeafStoredFieldsLookup indexStoredFields = lookup.getLeafSearchLookup(reader.getContext()).fields();
            indexStoredFields.setDocument(0);
            
            assertThat(storedFields.get("field").getValues(), equalTo(indexStoredFields.get("field").getValues()));
        });
    }
    public final void testNullInput() throws Exception {
        DocumentMapper mapper = createDocumentMapper(fieldMapping(this::minimalMapping));
        if (allowsNullValues()) {
            ParsedDocument doc = mapper.parse(source(b -> b.nullField("field")));
            assertThat(doc.docs().get(0).getFields("field").length, equalTo(0));