Missing src/Elastic/Types after composer require

I'm not sure how these files could be missing, but I've tried both in my main project and a default empty `composer init` project, and once installed, the only actual file present under src is `src/Elastic/Monolog/Formatter/ElasticCommonSchemaFormatter.php`.

`src/Elastic/Types` does not exist.

Reproduction:

```bash
mkdir emptyproject && cd emptyproject
composer init
[... hit enter to accept all defaults ...]
composer require elastic/ecs-logging
ls -la vendor/elastic/ecs-logging/src/Elastic/Monolog # exists
ls -la vendor/elastic/ecs-logging/src/Elastic/Types # does not exist
```

Do you get the same result?