Could Support bool.filter Query?

such as:

```json
{
"query": {
"bool": {
"filter": [
{
"nested": {
"path": "path_to_nested_doc",
"query": {}
}
}
]
}
}
}
```

Start at the bool query-builder entry point and trace how the shown bool.filter structure and nested query are represented. Compare the requested JSON with the builder's current output and identify the relevant query tests. Done means the example structure can be constructed and produces the expected Elasticsearch query.

Written by the indexing model from the issue text.