### Elasticsearch Version

8.8.0-SNAPSHOT

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

MacOS

### Problem Description

API when called is returning invalid response, on the same data terms aggs query runs fine 

![image](https://user-images.githubusercontent.com/3505601/220749805-ddf0d735-60d5-4e45-85bf-941ea3076a3f.png)


When run as aggs query 

![image](https://user-images.githubusercontent.com/3505601/220764360-49f7b648-8b15-43cf-afe2-01bd62e8ebc5.png)


### Steps to Reproduce

Queries are mentioned above ^^

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/index/mapper/flattened/FlattenedFieldMapper.java
return new KeyedFlattenedLeafFieldData(key, fieldData, toScriptFieldFactory);
        }
        @Override
        public LeafOrdinalsFieldData loadDirect(LeafReaderContext context) throws Exception {
            LeafOrdinalsFieldData fieldData = delegate.loadDirect(context);
            return new KeyedFlattenedLeafFieldData(key, fieldData, toScriptFieldFactory);
        }
        @Override
        public IndexOrdinalsFieldData loadGlobal(DirectoryReader indexReader) {
            IndexOrdinalsFieldData fieldData = delegate.loadGlobal(indexReader);
            return new KeyedFlattenedFieldData(key, fieldData, toScriptFieldFactory);
        }
        @Override
        public IndexOrdinalsFieldData loadGlobalDirect(DirectoryReader indexReader) throws Exception {
            IndexOrdinalsFieldData fieldData = delegate.loadGlobalDirect(indexReader);
            return new KeyedFlattenedFieldData(key, fieldData, toScriptFieldFactory);
        }
        @Override
        public OrdinalMap getOrdinalMap() {
            throw new UnsupportedOperationException(
                "The field data for the flattened field ["
                    + delegate.getFieldName()
                    + "] does not allow access to the underlying ordinal map."
            );
        }
        @Override
        public boolean supportsGlobalOrdinalsMapping() {
            return false;
        }
        public static class Builder implements IndexFieldData.Builder {