[Backport 8.14] VectorStore for GenAI integrations

dev-requirements.txt

@@ -15,10 +15,13 @@ twine
 build
 nox
 
-numpy
 pandas
 orjson
 
+# mmr for vectorstore
+numpy
+simsimd
+
 # Testing the 'search_mvt' API response
 mapbox-vector-tile
 # Python 3.7 gets an old version of mapbox-vector-tile, requiring an

elasticsearch/helpers/vectorstore/__init__.py

@@ -0,0 +1,62 @@
+#  Licensed to Elasticsearch B.V. under one or more contributor
+#  license agreements. See the NOTICE file distributed with
+#  this work for additional information regarding copyright
+#  ownership. Elasticsearch B.V. licenses this file to you under
+#  the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+# 	http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.
+
+from elasticsearch.helpers.vectorstore._async.embedding_service import (
+    AsyncElasticsearchEmbeddings,
+    AsyncEmbeddingService,
+)
+from elasticsearch.helpers.vectorstore._async.strategies import (
+    AsyncBM25Strategy,
+    AsyncDenseVectorScriptScoreStrategy,
+    AsyncDenseVectorStrategy,
+    AsyncRetrievalStrategy,
+    AsyncSparseVectorStrategy,
+)
+from elasticsearch.helpers.vectorstore._async.vectorstore import AsyncVectorStore
+from elasticsearch.helpers.vectorstore._sync.embedding_service import (
+    ElasticsearchEmbeddings,
+    EmbeddingService,
+)
+from elasticsearch.helpers.vectorstore._sync.strategies import (
+    BM25Strategy,
+    DenseVectorScriptScoreStrategy,
+    DenseVectorStrategy,
+    RetrievalStrategy,
+    SparseVectorStrategy,
+)
+from elasticsearch.helpers.vectorstore._sync.vectorstore import VectorStore
+from elasticsearch.helpers.vectorstore._utils import DistanceMetric
+
+__all__ = [
+    "AsyncBM25Strategy",
+    "AsyncDenseVectorScriptScoreStrategy",
+    "AsyncDenseVectorStrategy",
+    "AsyncElasticsearchEmbeddings",
+    "AsyncEmbeddingService",
+    "AsyncRetrievalStrategy",
+    "AsyncSparseVectorStrategy",
+    "AsyncVectorStore",
+    "BM25Strategy",
+    "DenseVectorScriptScoreStrategy",
+    "DenseVectorStrategy",
+    "DistanceMetric",
+    "ElasticsearchEmbeddings",
+    "EmbeddingService",
+    "RetrievalStrategy",
+    "SparseVectorStrategy",
+    "VectorStore",
+]

elasticsearch/helpers/vectorstore/_async/__init__.py

@@ -0,0 +1,16 @@
+#  Licensed to Elasticsearch B.V. under one or more contributor
+#  license agreements. See the NOTICE file distributed with
+#  this work for additional information regarding copyright
+#  ownership. Elasticsearch B.V. licenses this file to you under
+#  the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+# 	http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.

elasticsearch/helpers/vectorstore/_async/_utils.py

@@ -0,0 +1,39 @@
+#  Licensed to Elasticsearch B.V. under one or more contributor
+#  license agreements. See the NOTICE file distributed with
+#  this work for additional information regarding copyright
+#  ownership. Elasticsearch B.V. licenses this file to you under
+#  the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+# 	http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.
+
+from elasticsearch import AsyncElasticsearch, BadRequestError, NotFoundError
+
+
+async def model_must_be_deployed(client: AsyncElasticsearch, model_id: str) -> None:
+    """
+    :raises [NotFoundError]: if the model is neither downloaded nor deployed.
+    :raises [ConflictError]: if the model is downloaded but not yet deployed.
+    """
+    doc = {"text_field": f"test if the model '{model_id}' is deployed"}
+    try:
+        await client.ml.infer_trained_model(model_id=model_id, docs=[doc])
+    except BadRequestError:
+        # The model is deployed but expects a different input field name.
+        pass
+
+
+async def model_is_deployed(client: AsyncElasticsearch, model_id: str) -> bool:
+    try:
+        await model_must_be_deployed(client, model_id)
+        return True
+    except NotFoundError:
+        return False

elasticsearch/helpers/vectorstore/_async/embedding_service.py

@@ -0,0 +1,89 @@
+#  Licensed to Elasticsearch B.V. under one or more contributor
+#  license agreements. See the NOTICE file distributed with
+#  this work for additional information regarding copyright
+#  ownership. Elasticsearch B.V. licenses this file to you under
+#  the Apache License, Version 2.0 (the "License"); you may
+#  not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+# 	http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.
+
+from abc import ABC, abstractmethod
+from typing import List
+
+from elasticsearch import AsyncElasticsearch
+from elasticsearch._version import __versionstr__ as lib_version
+
+
+class AsyncEmbeddingService(ABC):
+    @abstractmethod
+    async def embed_documents(self, texts: List[str]) -> List[List[float]]:
+        """Generate embeddings for a list of documents.
+
+        :param texts: A list of document strings to generate embeddings for.
+
+        :return: A list of embeddings, one for each document in the input.
+        """
+
+    @abstractmethod
+    async def embed_query(self, query: str) -> List[float]:
+        """Generate an embedding for a single query text.
+
+        :param text: The query text to generate an embedding for.
+
+        :return: The embedding for the input query text.
+        """
+
+
+class AsyncElasticsearchEmbeddings(AsyncEmbeddingService):
+    """Elasticsearch as a service for embedding model inference.
+
+    You need to have an embedding model downloaded and deployed in Elasticsearch:
+    - https://www.elastic.co/guide/en/elasticsearch/reference/current/infer-trained-model.html
+    - https://www.elastic.co/guide/en/machine-learning/current/ml-nlp-deploy-models.html
+    """  # noqa: E501
+
+    def __init__(
+        self,
+        *,
+        client: AsyncElasticsearch,
+        model_id: str,
+        input_field: str = "text_field",
+        user_agent: str = f"elasticsearch-py-es/{lib_version}",
+    ):
+        """
+        :param agent_header: user agent header specific to the 3rd party integration.
+            Used for usage tracking in Elastic Cloud.
+        :param model_id: The model_id of the model deployed in the Elasticsearch cluster.
+        :param input_field: The name of the key for the input text field in the
+            document. Defaults to 'text_field'.
+        :param client: Elasticsearch client connection. Alternatively specify the
+            Elasticsearch connection with the other es_* parameters.
+        """
+        # Add integration-specific usage header for tracking usage in Elastic Cloud.
+        # client.options preserves existing (non-user-agent) headers.
+        client = client.options(headers={"User-Agent": user_agent})
+
+        self.client = client
+        self.model_id = model_id
+        self.input_field = input_field
+
+    async def embed_documents(self, texts: List[str]) -> List[List[float]]:
+        return await self._embedding_func(texts)
+
+    async def embed_query(self, text: str) -> List[float]:
+        result = await self._embedding_func([text])
+        return result[0]
+
+    async def _embedding_func(self, texts: List[str]) -> List[List[float]]:
+        response = await self.client.ml.infer_trained_model(
+            model_id=self.model_id, docs=[{self.input_field: text} for text in texts]
+        )
+        return [doc["predicted_value"] for doc in response["inference_results"]]