# AsyncElasticsearchRetriever

> **Class** in `langchain_elasticsearch`

📖 [View in docs](https://reference.langchain.com/python/langchain-elasticsearch/retrievers/AsyncElasticsearchRetriever)

## Signature

```python
AsyncElasticsearchRetriever(
    self,
    index_name: Union[str, Sequence[str]],
    body_func: Callable[[str], Dict],
    *,
    content_field: Optional[Union[str, Mapping[str, str]]] = None,
    document_mapper: Optional[Callable[[Mapping], Document]] = None,
    client: Optional[AsyncElasticsearch] = None,
    es_url: Optional[str] = None,
    es_cloud_id: Optional[str] = None,
    es_user: Optional[str] = None,
    es_api_key: Optional[str] = None,
    es_password: Optional[str] = None,
)
```

## Extends

- `_AsyncElasticsearchRetriever`

---

[View source on GitHub](https://github.com/langchain-ai/langchain-elastic/blob/e78a327f38e09abd10128ed28c8774e9a8f9fec0/libs/elasticsearch/langchain_elasticsearch/retrievers.py#L16)