docs: sync Core Integrations API reference (vespa) on Docusaurus

docs-website/reference/integrations-api/vespa.md

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+---
+title: "Vespa"
+id: integrations-vespa
+description: "Vespa integration for Haystack"
+slug: "/integrations-vespa"
+---
+
+
+## haystack_integrations.components.retrievers.vespa.embedding_retriever
+
+### VespaEmbeddingRetriever
+
+Retrieve documents from Vespa using dense vector similarity.
+
+#### __init__
+
+```python
+__init__(
+    *,
+    document_store: VespaDocumentStore,
+    filters: dict[str, Any] | None = None,
+    top_k: int = 10,
+    ranking: str | None = DEFAULT_SEMANTIC_RANKING,
+    query_tensor_name: str = "query_embedding",
+    target_hits: int | None = None
+) -> None
+```
+
+Create a Vespa embedding retriever.
+
+**Parameters:**
+
+- **document_store** (<code>VespaDocumentStore</code>) – Configured `VespaDocumentStore` for your application, for example
+  `VespaDocumentStore(url="http://localhost", schema="doc", namespace="doc")` aligned with your
+  Vespa schema. See https://docs.vespa.ai/en/basics/documents.html and the integration package README.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Optional static Haystack metadata filters unless overridden in :meth:`run`, for example
+  `{"field": "meta.category", "operator": "==", "value": "news"}`. See
+  https://docs.haystack.deepset.ai/docs/metadata-filtering and https://docs.vespa.ai/en/query-language.html.
+- **top_k** (<code>int</code>) – Default maximum number of documents to return per query (for example `10`).
+- **ranking** (<code>str | None</code>) – Vespa rank profile used after nearest-neighbor retrieval, for example `semantic` for a
+  profile that scores with `closeness(field, embedding)`. Defaults to `semantic`. Pass `None` to use the
+  schema default profile. See https://docs.vespa.ai/en/basics/ranking.html.
+- **query_tensor_name** (<code>str</code>) – Name of the query tensor in YQL and in `input.query(...)` in your rank profile.
+  For example `query_embedding` matches the default `semantic` profile. See
+  https://docs.vespa.ai/en/nearest-neighbor-search.html.
+- **target_hits** (<code>int | None</code>) – Optional nearest-neighbor `targetHits` value, for example `10` or `100`: how many
+  neighbors are considered per content node before first-phase ranking. See
+  https://docs.vespa.ai/en/nearest-neighbor-search.html.
+
+**Raises:**
+
+- <code>ValueError</code> – If `document_store` is not an instance of VespaDocumentStore.
+
+#### run
+
+```python
+run(
+    query_embedding: list[float],
+    filters: dict[str, Any] | None = None,
+    top_k: int | None = None,
+) -> dict[str, list[Document]]
+```
+
+Retrieve documents from Vespa.
+
+**Parameters:**
+
+- **query_embedding** (<code>list\[float\]</code>) – Dense query embedding.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters applied when fetching documents from the Document Store.
+- **top_k** (<code>int | None</code>) – Maximum number of documents to return.
+
+**Returns:**
+
+- <code>dict\[str, list\[Document\]\]</code> – Retrieved documents.
+
+## haystack_integrations.components.retrievers.vespa.keyword_retriever
+
+### VespaKeywordRetriever
+
+Retrieve documents from Vespa using lexical search.
+
+#### __init__
+
+```python
+__init__(
+    *,
+    document_store: VespaDocumentStore,
+    filters: dict[str, Any] | None = None,
+    top_k: int = 10,
+    ranking: str | None = DEFAULT_BM25_RANKING
+) -> None
+```
+
+Create a Vespa keyword retriever.
+
+**Parameters:**
+
+- **document_store** (<code>VespaDocumentStore</code>) – Configured `VespaDocumentStore` for your application, for example
+  `VespaDocumentStore(url="http://localhost", schema="doc", namespace="doc")` so it matches the deployed
+  schema and endpoint. See https://docs.vespa.ai/en/basics/documents.html and the integration package README.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Optional static Haystack metadata filters applied on each retrieval unless overridden in
+  :meth:`run`, for example `{"field": "meta.category", "operator": "==", "value": "news"}`. See
+  https://docs.haystack.deepset.ai/docs/metadata-filtering and https://docs.vespa.ai/en/query-language.html.
+- **top_k** (<code>int</code>) – Default maximum number of documents to return per query (for example `10`).
+- **ranking** (<code>str | None</code>) – Vespa rank profile for lexical matches, for example `bm25` for a profile that uses
+  `bm25(content)`. Defaults to `bm25`. Pass `None` to use the schema default. See
+  https://docs.vespa.ai/en/basics/ranking.html.
+
+**Raises:**
+
+- <code>ValueError</code> – If `document_store` is not an instance of VespaDocumentStore.
+
+#### run
+
+```python
+run(
+    query: str, filters: dict[str, Any] | None = None, top_k: int | None = None
+) -> dict[str, list[Document]]
+```
+
+Retrieve documents from Vespa.
+
+**Parameters:**
+
+- **query** (<code>str</code>) – Query text.
+- **filters** (<code>dict\[str, Any\] | None</code>) – Filters applied when fetching documents from the Document Store.
+- **top_k** (<code>int | None</code>) – Maximum number of documents to return.
+
+**Returns:**
+
+- <code>dict\[str, list\[Document\]\]</code> – Retrieved documents.
+
+## haystack_integrations.document_stores.vespa.document_store
+
+### VespaDocumentStore
+
+Document store backed by an existing [Vespa](https://vespa.ai/) application.
+
+#### __init__
+
+```python
+__init__(
+    *,
+    url: str | None = None,
+    port: int = 8080,
+    cert: Secret | None = None,
+    key: Secret | None = None,
+    vespa_cloud_secret_token: Secret | None = None,
+    additional_headers: dict[str, str] | None = None,
+    content_cluster_name: str = "content",
+    schema: str = "doc",
+    namespace: str | None = None,
+    groupname: str | None = None,
+    content_field: str = "content",
+    embedding_field: str = "embedding",
+    id_field: str = "id",
+    metadata_fields: list[str] | None = None,
+    query_limit: int = DEFAULT_QUERY_LIMIT
+) -> None
+```
+
+Create a new Vespa document store.
+
+**Parameters:**
+
+- **url** (<code>str | None</code>) – Vespa endpoint base URL. If omitted, the `VESPA_URL` environment variable is used.
+- **port** (<code>int</code>) – Vespa HTTP port.
+- **cert** (<code>Secret | None</code>) – Secret resolving to the data plane certificate file path for mTLS authentication.
+- **key** (<code>Secret | None</code>) – Secret resolving to the data plane key file path for mTLS authentication.
+- **vespa_cloud_secret_token** (<code>Secret | None</code>) – Vespa Cloud data plane secret token for token authentication.
+  If omitted, the `VESPA_CLOUD_SECRET_TOKEN` environment variable is used when set, matching pyvespa.
+- **additional_headers** (<code>dict\[str, str\] | None</code>) – Additional headers to send to the Vespa application.
+- **content_cluster_name** (<code>str</code>) – Vespa content cluster name.
+- **schema** (<code>str</code>) – Vespa schema name to read from and write to.
+- **namespace** (<code>str | None</code>) – Vespa namespace. Defaults to the schema name when omitted.
+- **groupname** (<code>str | None</code>) – Optional Vespa group name.
+- **content_field** (<code>str</code>) – Vespa field containing the document text.
+- **embedding_field** (<code>str</code>) – Vespa field containing the dense embedding.
+- **id_field** (<code>str</code>) – Optional Vespa field containing the document id in query responses.
+  Vespa document IDs are always written via `data_id`. If this field is missing in the
+  schema or summaries, the integration falls back to parsing the Vespa document path.
+- **metadata_fields** (<code>list\[str\] | None</code>) – Optional allowlist of metadata fields to feed and return.
+- **query_limit** (<code>int</code>) – Maximum number of documents returned by bulk queries. Defaults to 400 to
+  stay within Vespa's common query hit limit unless explicitly overridden.
+
+#### app
+
+```python
+app: Any
+```
+
+Return the underlying `pyvespa` `Vespa` HTTP client.
+
+It is built from this store's `url`, `port`, and authentication settings
+(`cert`, `key`, `vespa_cloud_secret_token`, `additional_headers`) so mTLS, bearer token,
+and custom headers from the constructor (or environment) are applied.
+
+#### to_dict
+
+```python
+to_dict() -> dict[str, Any]
+```
+
+Serialize the document store to a dictionary.
+
+Uses the same init-parameter names as :meth:`__init__` and `default_to_dict` so nested serialization stays
+aligned with Haystack's default component serialization.
+
+**Returns:**
+
+- <code>dict\[str, Any\]</code> – Serialized document store data.
+
+#### count_documents
+
+```python
+count_documents() -> int
+```
+
+Return the total number of documents in Vespa.
+
+**Returns:**
+
+- <code>int</code> – Document count.
+
+#### count_documents_by_filter
+
+```python
+count_documents_by_filter(filters: dict[str, Any]) -> int
+```
+
+Return the number of documents matching the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – Haystack metadata filters.
+
+**Returns:**
+
+- <code>int</code> – Count of matching documents.
+
+#### write_documents
+
+```python
+write_documents(
+    documents: list[Document], policy: DuplicatePolicy = DuplicatePolicy.NONE
+) -> int
+```
+
+Write documents to Vespa.
+
+**Parameters:**
+
+- **documents** (<code>list\[Document\]</code>) – Documents to store.
+- **policy** (<code>DuplicatePolicy</code>) – Duplicate handling policy.
+
+**Returns:**
+
+- <code>int</code> – Number of documents written.
+
+#### delete_documents
+
+```python
+delete_documents(document_ids: list[str]) -> None
+```
+
+Delete documents by id.
+
+**Parameters:**
+
+- **document_ids** (<code>list\[str\]</code>) – Document ids to delete.
+
+#### delete_all_documents
+
+```python
+delete_all_documents() -> None
+```
+
+Delete all documents for this store's schema, namespace, and content cluster.
+
+Implemented with pyvespa `Vespa.delete_all_docs` (Document V1 bulk delete).
+
+#### delete_by_filter
+
+```python
+delete_by_filter(filters: dict[str, Any]) -> int
+```
+
+Delete all documents matching the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – Haystack metadata filters.
+
+**Returns:**
+
+- <code>int</code> – Number of deleted documents.
+
+#### update_by_filter
+
+```python
+update_by_filter(filters: dict[str, Any], meta: dict[str, Any]) -> int
+```
+
+Update metadata fields for documents matching the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\]</code>) – Haystack metadata filters.
+- **meta** (<code>dict\[str, Any\]</code>) – Metadata values to merge into the matched documents.
+
+**Returns:**
+
+- <code>int</code> – Number of updated documents.
+
+#### get_documents_by_id
+
+```python
+get_documents_by_id(document_ids: list[str]) -> list[Document]
+```
+
+Retrieve documents by their ids.
+
+**Parameters:**
+
+- **document_ids** (<code>list\[str\]</code>) – Document ids to fetch.
+
+**Returns:**
+
+- <code>list\[Document\]</code> – Matching documents.
+
+#### filter_documents
+
+```python
+filter_documents(filters: dict[str, Any] | None = None) -> list[Document]
+```
+
+Retrieve documents matching the provided filters.
+
+**Parameters:**
+
+- **filters** (<code>dict\[str, Any\] | None</code>) – Haystack metadata filters.
+
+**Returns:**
+
+- <code>list\[Document\]</code> – Matching documents.
+
+#### get_metadata_fields_info
+
+```python
+get_metadata_fields_info() -> dict[str, dict[str, str]]
+```
+
+Return best-effort metadata field information based on configured fields.
+
+**Returns:**
+
+- <code>dict\[str, dict\[str, str\]\]</code> – Field metadata information.
+
+## haystack_integrations.document_stores.vespa.filters