### 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
List<UpdateCheck> updateChecks = new ArrayList<>();
        Map<String, ConflictCheck> conflictChecks = new HashMap<>();
        /**
         * Register a check that a parameter can be updated, using the minimal mapping as a base
         *
         * @param update a field builder applied on top of the minimal mapping
         * @param check  a check that the updated parameter has been applied to the FieldMapper
         */
        public void registerUpdateCheck(CheckedConsumer<XContentBuilder, IOException> update, Consumer<FieldMapper> check)
            throws IOException {
            updateChecks.add(new UpdateCheck(update, check));