### 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
IndexableFieldType indexableFieldType = indexableField.fieldType();
            if (indexableFieldType.indexOptions() != IndexOptions.NONE) {
                assertFalse(indexableFieldType.omitNorms());
                return;
            }
        }
        fail("field [" + field + "] should be indexed but it isn't");
    }
    protected static void assertNoDocValuesField(LuceneDocument doc, String field) {
        IndexableField[] fields = doc.getFields(field);
        for (IndexableField indexableField : fields) {
            assertEquals(DocValuesType.NONE, indexableField.fieldType().docValuesType());
        }
    }
    protected <T> void assertDimension(boolean isDimension, Function<T, Boolean> checker) throws IOException {
        MapperService mapperService = createMapperService(fieldMapping(b -> {
            minimalMapping(b);
            b.field("time_series_dimension", isDimension);
        }));
        @SuppressWarnings("unchecked") 
        T fieldType = (T) mapperService.fieldType("field");
        assertThat(checker.apply(fieldType), equalTo(isDimension));
    }
    protected <T> void assertMetricType(String metricType, Function<T, Enum<TimeSeriesParams.MetricType>> checker) throws IOException {
        MapperService mapperService = createMapperService(fieldMapping(b -> {
            minimalMapping(b);
            b.field("time_series_metric", metricType);
        }));
        @SuppressWarnings("unchecked") 
        T fieldType = (T) mapperService.fieldType("field");