OpenSearchVectorSearch#

class langchain_community.vectorstores.opensearch_vector_search.OpenSearchVectorSearch(opensearch_url: str, index_name: str, embedding_function: Embeddings, **kwargs: Any)[source]#

Amazon OpenSearch Vector Engine vector store.

Example

from langchain_community.vectorstores import OpenSearchVectorSearch
opensearch_vector_search = OpenSearchVectorSearch(
    "http://localhost:9200",
    "embeddings",
    embedding_function
)

Initialize with necessary components.

Attributes

embeddings

Access the query embedding object if available.

Methods

__init__(opensearch_url, index_name, ...)

Initialize with necessary components.

aadd_documents(documents, **kwargs)

Async run more documents through the embeddings and add to the vectorstore.

aadd_texts(texts[, metadatas, ids, bulk_size])

Asynchronously run more texts through the embeddings and add to the vectorstore.

add_documents(documents, **kwargs)

Add or update documents in the vectorstore.

add_embeddings(text_embeddings[, metadatas, ...])

Add the given texts and embeddings to the vectorstore.

add_texts(texts[, metadatas, ids, bulk_size])

Run more texts through the embeddings and add to the vectorstore.

adelete([ids])

Asynchronously delete by vector ID or other criteria.

afrom_documents(documents, embedding, **kwargs)

Async return VectorStore initialized from documents and embeddings.

afrom_embeddings(embeddings, texts, embedding)

Asynchronously construct OpenSearchVectorSearch wrapper from pre-vectorized embeddings.

afrom_texts(texts, embedding[, metadatas, ...])

Asynchronously construct OpenSearchVectorSearch wrapper from raw texts.

aget_by_ids(ids, /)

Async get documents by their IDs.

amax_marginal_relevance_search(query[, k, ...])

Async return docs selected using the maximal marginal relevance.

amax_marginal_relevance_search_by_vector(...)

Async return docs selected using the maximal marginal relevance.

as_retriever(**kwargs)

Return VectorStoreRetriever initialized from this VectorStore.

asearch(query, search_type, **kwargs)

Async return docs most similar to query using a specified search type.

asimilarity_search(query[, k])

Async return docs most similar to query.

asimilarity_search_by_vector(embedding[, k])

Async return docs most similar to embedding vector.

asimilarity_search_with_relevance_scores(query)

Async return docs and relevance scores in the range [0, 1].

asimilarity_search_with_score(*args, **kwargs)

Async run similarity search with distance.

create_index(dimension[, index_name])

Create a new Index with given arguments

delete([ids, refresh_indices])

Delete documents from the Opensearch index.

delete_index([index_name])

Deletes a given index from vectorstore.

from_documents(documents, embedding, **kwargs)

Return VectorStore initialized from documents and embeddings.

from_embeddings(embeddings, texts, embedding)

Construct OpenSearchVectorSearch wrapper from pre-vectorized embeddings.

from_texts(texts, embedding[, metadatas, ...])

Construct OpenSearchVectorSearch wrapper from raw texts.

get_by_ids(ids, /)

Get documents by their IDs.

index_exists([index_name])

If given index present in vectorstore, returns True else False.

max_marginal_relevance_search(query[, k, ...])

Return docs selected using the maximal marginal relevance.

max_marginal_relevance_search_by_vector(...)

Return docs selected using the maximal marginal relevance.

search(query, search_type, **kwargs)

Return docs most similar to query using a specified search type.

similarity_search(query[, k, score_threshold])

Return docs most similar to query.

similarity_search_by_vector(embedding[, k, ...])

Return docs most similar to the embedding vector.

similarity_search_with_relevance_scores(query)

Return docs and relevance scores in the range [0, 1].

similarity_search_with_score(query[, k, ...])

Return docs and it's scores most similar to query.

similarity_search_with_score_by_vector(embedding)

Return docs and it's scores most similar to the embedding vector.
Parameters:

  • opensearch_url (str)

  • index_name (str)

  • embedding_function (Embeddings)

  • kwargs (Any)

__init__(opensearch_url: str, index_name: str, embedding_function: Embeddings, **kwargs: Any)[source]#

Initialize with necessary components.

Parameters:

  • opensearch_url (str)

  • index_name (str)

  • embedding_function (Embeddings)

  • kwargs (Any)

async aadd_documents(documents: list[Document], **kwargs: Any) → list[str]#

Async run more documents through the embeddings and add to the vectorstore.

Parameters:

  • documents (list[Document]) – Documents to add to the vectorstore.

  • kwargs (Any) – Additional keyword arguments.

Returns:

List of IDs of the added texts.

Raises:

ValueError – If the number of IDs does not match the number of documents.

Return type:

list[str]

async aadd_texts(texts: Iterable[str], metadatas: List[dict] | None = None, ids: List[str] | None = None, bulk_size: int = 500, **kwargs: Any) → List[str][source]#

Asynchronously run more texts through the embeddings and add to the vectorstore.

Parameters:

  • texts (Iterable[str])

  • metadatas (List[dict] | None)

  • ids (List[str] | None)

  • bulk_size (int)

  • kwargs (Any)

Return type:

List[str]

add_documents(documents: list[Document], **kwargs: Any) → list[str]#

Add or update documents in the vectorstore.

Parameters:

  • documents (list[Document]) – Documents to add to the vectorstore.

  • kwargs (Any) – Additional keyword arguments. if kwargs contains ids and documents contain ids, the ids in the kwargs will receive precedence.

Returns:

List of IDs of the added texts.

Raises:

ValueError – If the number of ids does not match the number of documents.

Return type:

list[str]

add_embeddings(text_embeddings: Iterable[Tuple[str, List[float]]], metadatas: List[dict] | None = None, ids: List[str] | None = None, bulk_size: int = 500, **kwargs: Any) → List[str][source]#

Add the given texts and embeddings to the vectorstore.

Parameters:

  • text_embeddings (Iterable[Tuple[str, List[float]]]) – Iterable pairs of string and embedding to add to the vectorstore.

  • metadatas (List[dict] | None) – Optional list of metadatas associated with the texts.

  • ids (List[str] | None) – Optional list of ids to associate with the texts.

  • bulk_size (int) – Bulk API request count; Default: 500

  • kwargs (Any)

Returns:

List of ids from adding the texts into the vectorstore.

Return type:

List[str]

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

add_texts(texts: Iterable[str], metadatas: List[dict] | None = None, ids: List[str] | None = None, bulk_size: int = 500, **kwargs: Any) → List[str][source]#

Run more texts through the embeddings and add to the vectorstore.

Parameters:

  • texts (Iterable[str]) – Iterable of strings to add to the vectorstore.

  • metadatas (List[dict] | None) – Optional list of metadatas associated with the texts.

  • ids (List[str] | None) – Optional list of ids to associate with the texts.

  • bulk_size (int) – Bulk API request count; Default: 500

  • kwargs (Any)

Returns:

List of ids from adding the texts into the vectorstore.

Return type:

List[str]

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

async adelete(ids: List[str] | None = None, **kwargs: Any) → bool | None[source]#

Asynchronously delete by vector ID or other criteria.

Parameters:

  • ids (List[str] | None) – List of ids to delete.

  • **kwargs (Any) – Other keyword arguments that subclasses might use.

Returns:

True if deletion is successful, False otherwise, None if not implemented.

Return type:

Optional[bool]

async classmethod afrom_documents(documents: list[Document], embedding: Embeddings, **kwargs: Any) → VST#

Async return VectorStore initialized from documents and embeddings.

Parameters:

  • documents (list[Document]) – List of Documents to add to the vectorstore.

  • embedding (Embeddings) – Embedding function to use.

  • kwargs (Any) – Additional keyword arguments.

Returns:

VectorStore initialized from documents and embeddings.

Return type:

VectorStore

async classmethod afrom_embeddings(embeddings: List[List[float]], texts: List[str], embedding: Embeddings, metadatas: List[dict] | None = None, bulk_size: int = 500, ids: List[str] | None = None, **kwargs: Any) → OpenSearchVectorSearch[source]#

Asynchronously construct OpenSearchVectorSearch wrapper from pre-vectorized embeddings.

Example

from langchain_community.vectorstores import OpenSearchVectorSearch
from langchain_community.embeddings import OpenAIEmbeddings
embedder = OpenAIEmbeddings()
embeddings = await embedder.aembed_documents(["foo", "bar"])
opensearch_vector_search =
    await OpenSearchVectorSearch.afrom_embeddings(
        embeddings,
        texts,
        embedder,
        opensearch_url="http://localhost:9200"
)

OpenSearch by default supports Approximate Search powered by nmslib, faiss and lucene engines recommended for large datasets. Also supports brute force search through Script Scoring and Painless Scripting.

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

Optional Keyword Args for Approximate Search:

engine: “nmslib”, “faiss”, “lucene”; default: “nmslib”

space_type: “l2”, “l1”, “cosinesimil”, “linf”, “innerproduct”; default: “l2”

ef_search: Size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches; default: 512

ef_construction: Size of the dynamic list used during k-NN graph creation. Higher values lead to more accurate graph but slower indexing speed; default: 512

m: Number of bidirectional links created for each new element. Large impact on memory consumption. Between 2 and 100; default: 16

Keyword Args for Script Scoring or Painless Scripting:

is_appx_search: False

Parameters:

  • embeddings (List[List[float]])

  • texts (List[str])

  • embedding (Embeddings)

  • metadatas (List[dict] | None)

  • bulk_size (int)

  • ids (List[str] | None)

  • kwargs (Any)

Return type:

OpenSearchVectorSearch

async classmethod afrom_texts(texts: List[str], embedding: Embeddings, metadatas: List[dict] | None = None, bulk_size: int = 500, ids: List[str] | None = None, **kwargs: Any) → OpenSearchVectorSearch[source]#

Asynchronously construct OpenSearchVectorSearch wrapper from raw texts.

Example

from langchain_community.vectorstores import OpenSearchVectorSearch
from langchain_community.embeddings import OpenAIEmbeddings
embeddings = OpenAIEmbeddings()
opensearch_vector_search = await OpenSearchVectorSearch.afrom_texts(
    texts,
    embeddings,
    opensearch_url="http://localhost:9200"
)

OpenSearch by default supports Approximate Search powered by nmslib, faiss and lucene engines recommended for large datasets. Also supports brute force search through Script Scoring and Painless Scripting.

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

Optional Keyword Args for Approximate Search:

engine: “nmslib”, “faiss”, “lucene”; default: “nmslib”

space_type: “l2”, “l1”, “cosinesimil”, “linf”, “innerproduct”; default: “l2”

ef_search: Size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches; default: 512

ef_construction: Size of the dynamic list used during k-NN graph creation. Higher values lead to more accurate graph but slower indexing speed; default: 512

m: Number of bidirectional links created for each new element. Large impact on memory consumption. Between 2 and 100; default: 16

Keyword Args for Script Scoring or Painless Scripting:

is_appx_search: False

Parameters:

  • texts (List[str])

  • embedding (Embeddings)

  • metadatas (List[dict] | None)

  • bulk_size (int)

  • ids (List[str] | None)

  • kwargs (Any)

Return type:

OpenSearchVectorSearch

async aget_by_ids(ids: Sequence[str], /) → list[Document]#

Async get documents by their IDs.

The returned documents are expected to have the ID field set to the ID of the document in the vector store.

Fewer documents may be returned than requested if some IDs are not found or if there are duplicated IDs.

Users should not assume that the order of the returned documents matches the order of the input IDs. Instead, users should rely on the ID field of the returned documents.

This method should NOT raise exceptions if no documents are found for some IDs.

Parameters:

ids (Sequence[str]) – List of ids to retrieve.

Returns:

List of Documents.

Return type:

list[Document]

Added in version 0.2.11.

Async return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters:

  • query (str) – Text to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm. Default is 20.

  • lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity. Defaults to 0.5.

  • kwargs (Any)

Returns:

List of Documents selected by maximal marginal relevance.

Return type:

list[Document]

async amax_marginal_relevance_search_by_vector(embedding: list[float], k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, **kwargs: Any) → list[Document]#

Async return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters:

  • embedding (list[float]) – Embedding to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm. Default is 20.

  • lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity. Defaults to 0.5.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents selected by maximal marginal relevance.

Return type:

list[Document]

as_retriever(**kwargs: Any) → VectorStoreRetriever#

Return VectorStoreRetriever initialized from this VectorStore.

Parameters:

**kwargs (Any) –

Keyword arguments to pass to the search function. Can include: search_type (Optional[str]): Defines the type of search that

the Retriever should perform. Can be “similarity” (default), “mmr”, or “similarity_score_threshold”.

search_kwargs (Optional[Dict]): Keyword arguments to pass to the
search function. Can include things like:

k: Amount of documents to return (Default: 4) score_threshold: Minimum relevance threshold

for similarity_score_threshold

fetch_k: Amount of documents to pass to MMR algorithm

(Default: 20)

lambda_mult: Diversity of results returned by MMR;

1 for minimum diversity and 0 for maximum. (Default: 0.5)

filter: Filter by document metadata

Returns:

Retriever class for VectorStore.

Return type:

VectorStoreRetriever

Examples:

# Retrieve more documents with higher diversity
# Useful if your dataset has many similar documents
docsearch.as_retriever(
    search_type="mmr",
    search_kwargs={'k': 6, 'lambda_mult': 0.25}
)

# Fetch more documents for the MMR algorithm to consider
# But only return the top 5
docsearch.as_retriever(
    search_type="mmr",
    search_kwargs={'k': 5, 'fetch_k': 50}
)

# Only retrieve documents that have a relevance score
# Above a certain threshold
docsearch.as_retriever(
    search_type="similarity_score_threshold",
    search_kwargs={'score_threshold': 0.8}
)

# Only get the single most similar document from the dataset
docsearch.as_retriever(search_kwargs={'k': 1})

# Use a filter to only retrieve documents from a specific paper
docsearch.as_retriever(
    search_kwargs={'filter': {'paper_title':'GPT-4 Technical Report'}}
)
async asearch(query: str, search_type: str, **kwargs: Any) → list[Document]#

Async return docs most similar to query using a specified search type.

Parameters:

  • query (str) – Input text.

  • search_type (str) – Type of search to perform. Can be “similarity”, “mmr”, or “similarity_score_threshold”.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents most similar to the query.

Raises:

ValueError – If search_type is not one of “similarity”, “mmr”, or “similarity_score_threshold”.

Return type:

list[Document]

Async return docs most similar to query.

Parameters:

  • query (str) – Input text.

  • k (int) – Number of Documents to return. Defaults to 4.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents most similar to the query.

Return type:

list[Document]

async asimilarity_search_by_vector(embedding: list[float], k: int = 4, **kwargs: Any) → list[Document]#

Async return docs most similar to embedding vector.

Parameters:

  • embedding (list[float]) – Embedding to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents most similar to the query vector.

Return type:

list[Document]

async asimilarity_search_with_relevance_scores(query: str, k: int = 4, **kwargs: Any) → list[tuple[Document, float]]#

Async return docs and relevance scores in the range [0, 1].

0 is dissimilar, 1 is most similar.

Parameters:

  • query (str) – Input text.

  • k (int) – Number of Documents to return. Defaults to 4.

  • **kwargs (Any) –

    kwargs to be passed to similarity search. Should include: score_threshold: Optional, a floating point value between 0 to 1 to

    filter the resulting set of retrieved docs

Returns:

List of Tuples of (doc, similarity_score)

Return type:

list[tuple[Document, float]]

async asimilarity_search_with_score(*args: Any, **kwargs: Any) → list[tuple[Document, float]]#

Async run similarity search with distance.

Parameters:

  • *args (Any) – Arguments to pass to the search method.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Tuples of (doc, similarity_score).

Return type:

list[tuple[Document, float]]

create_index(dimension: int, index_name: str | None = 'f2661cd84a554d39a5a7e439f9230970', **kwargs: Any) → str | None[source]#

Create a new Index with given arguments

Parameters:

  • dimension (int)

  • index_name (str | None)

  • kwargs (Any)

Return type:

str | None

delete(ids: List[str] | None = None, refresh_indices: bool | None = True, **kwargs: Any) → bool | None[source]#

Delete documents from the Opensearch index.

Parameters:

  • ids (List[str] | None) – List of ids of documents to delete.

  • refresh_indices (bool | None) – Whether to refresh the index after deleting documents. Defaults to True.

  • kwargs (Any)

Return type:

bool | None

delete_index(index_name: str | None = None) → bool | None[source]#

Deletes a given index from vectorstore.

Parameters:

index_name (str | None)

Return type:

bool | None

classmethod from_documents(documents: list[Document], embedding: Embeddings, **kwargs: Any) → VST#

Return VectorStore initialized from documents and embeddings.

Parameters:

  • documents (list[Document]) – List of Documents to add to the vectorstore.

  • embedding (Embeddings) – Embedding function to use.

  • kwargs (Any) – Additional keyword arguments.

Returns:

VectorStore initialized from documents and embeddings.

Return type:

VectorStore

classmethod from_embeddings(embeddings: List[List[float]], texts: List[str], embedding: Embeddings, metadatas: List[dict] | None = None, bulk_size: int = 500, ids: List[str] | None = None, **kwargs: Any) → OpenSearchVectorSearch[source]#

Construct OpenSearchVectorSearch wrapper from pre-vectorized embeddings.

Example

from langchain_community.vectorstores import OpenSearchVectorSearch
from langchain_community.embeddings import OpenAIEmbeddings
embedder = OpenAIEmbeddings()
embeddings = embedder.embed_documents(["foo", "bar"])
opensearch_vector_search = OpenSearchVectorSearch.from_embeddings(
    embeddings,
    texts,
    embedder,
    opensearch_url="http://localhost:9200"
)

OpenSearch by default supports Approximate Search powered by nmslib, faiss and lucene engines recommended for large datasets. Also supports brute force search through Script Scoring and Painless Scripting.

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

Optional Keyword Args for Approximate Search:

engine: “nmslib”, “faiss”, “lucene”; default: “nmslib”

space_type: “l2”, “l1”, “cosinesimil”, “linf”, “innerproduct”; default: “l2”

ef_search: Size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches; default: 512

ef_construction: Size of the dynamic list used during k-NN graph creation. Higher values lead to more accurate graph but slower indexing speed; default: 512

m: Number of bidirectional links created for each new element. Large impact on memory consumption. Between 2 and 100; default: 16

Keyword Args for Script Scoring or Painless Scripting:

is_appx_search: False

Parameters:

  • embeddings (List[List[float]])

  • texts (List[str])

  • embedding (Embeddings)

  • metadatas (List[dict] | None)

  • bulk_size (int)

  • ids (List[str] | None)

  • kwargs (Any)

Return type:

OpenSearchVectorSearch

classmethod from_texts(texts: List[str], embedding: Embeddings, metadatas: List[dict] | None = None, bulk_size: int = 500, ids: List[str] | None = None, **kwargs: Any) → OpenSearchVectorSearch[source]#

Construct OpenSearchVectorSearch wrapper from raw texts.

Example

from langchain_community.vectorstores import OpenSearchVectorSearch
from langchain_community.embeddings import OpenAIEmbeddings
embeddings = OpenAIEmbeddings()
opensearch_vector_search = OpenSearchVectorSearch.from_texts(
    texts,
    embeddings,
    opensearch_url="http://localhost:9200"
)

OpenSearch by default supports Approximate Search powered by nmslib, faiss and lucene engines recommended for large datasets. Also supports brute force search through Script Scoring and Painless Scripting.

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

Optional Keyword Args for Approximate Search:

engine: “nmslib”, “faiss”, “lucene”; default: “nmslib”

space_type: “l2”, “l1”, “cosinesimil”, “linf”, “innerproduct”; default: “l2”

ef_search: Size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches; default: 512

ef_construction: Size of the dynamic list used during k-NN graph creation. Higher values lead to more accurate graph but slower indexing speed; default: 512

m: Number of bidirectional links created for each new element. Large impact on memory consumption. Between 2 and 100; default: 16

Keyword Args for Script Scoring or Painless Scripting:

is_appx_search: False

Parameters:

  • texts (List[str])

  • embedding (Embeddings)

  • metadatas (List[dict] | None)

  • bulk_size (int)

  • ids (List[str] | None)

  • kwargs (Any)

Return type:

OpenSearchVectorSearch

get_by_ids(ids: Sequence[str], /) → list[Document]#

Get documents by their IDs.

The returned documents are expected to have the ID field set to the ID of the document in the vector store.

Fewer documents may be returned than requested if some IDs are not found or if there are duplicated IDs.

Users should not assume that the order of the returned documents matches the order of the input IDs. Instead, users should rely on the ID field of the returned documents.

This method should NOT raise exceptions if no documents are found for some IDs.

Parameters:

ids (Sequence[str]) – List of ids to retrieve.

Returns:

List of Documents.

Return type:

list[Document]

Added in version 0.2.11.

index_exists(index_name: str | None = None) → bool | None[source]#

If given index present in vectorstore, returns True else False.

Parameters:

index_name (str | None)

Return type:

bool | None

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters:

  • query (str) – Text to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm. Defaults to 20.

  • lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity. Defaults to 0.5.

  • kwargs (Any)

Returns:

List of Documents selected by maximal marginal relevance.

Return type:

list[Document]

max_marginal_relevance_search_by_vector(embedding: list[float], k: int = 4, fetch_k: int = 20, lambda_mult: float = 0.5, **kwargs: Any) → list[Document]#

Return docs selected using the maximal marginal relevance.

Maximal marginal relevance optimizes for similarity to query AND diversity among selected documents.

Parameters:

  • embedding (list[float]) – Embedding to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • fetch_k (int) – Number of Documents to fetch to pass to MMR algorithm. Default is 20.

  • lambda_mult (float) – Number between 0 and 1 that determines the degree of diversity among the results with 0 corresponding to maximum diversity and 1 to minimum diversity. Defaults to 0.5.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents selected by maximal marginal relevance.

Return type:

list[Document]

search(query: str, search_type: str, **kwargs: Any) → list[Document]#

Return docs most similar to query using a specified search type.

Parameters:

  • query (str) – Input text

  • search_type (str) – Type of search to perform. Can be “similarity”, “mmr”, or “similarity_score_threshold”.

  • **kwargs (Any) – Arguments to pass to the search method.

Returns:

List of Documents most similar to the query.

Raises:

ValueError – If search_type is not one of “similarity”, “mmr”, or “similarity_score_threshold”.

Return type:

list[Document]

Return docs most similar to query.

By default, supports Approximate Search. Also supports Script Scoring and Painless Scripting.

Parameters:

  • query (str) – Text to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • score_threshold (float | None) – Specify a score threshold to return only documents

  • 0.0. (above the threshold. Defaults to)

  • kwargs (Any)

Returns:

List of Documents most similar to the query.

Return type:

List[Document]

Optional Args:

vector_field: Document field embeddings are stored in. Defaults to “vector_field”.

text_field: Document field the text of the document is stored in. Defaults to “text”.

metadata_field: Document field that metadata is stored in. Defaults to “metadata”. Can be set to a special value “*” to include the entire document.

Optional Args for Approximate Search:

search_type: “approximate_search”; default: “approximate_search”

boolean_filter: A Boolean filter is a post filter consists of a Boolean query that contains a k-NN query and a filter.

subquery_clause: Query clause on the knn vector field; default: “must”

lucene_filter: the Lucene algorithm decides whether to perform an exact k-NN search with pre-filtering or an approximate search with modified post-filtering. (deprecated, use efficient_filter)

efficient_filter: the Lucene Engine or Faiss Engine decides whether to perform an exact k-NN search with pre-filtering or an approximate search with modified post-filtering.

Optional Args for Script Scoring Search:

search_type: “script_scoring”; default: “approximate_search”

space_type: “l2”, “l1”, “linf”, “cosinesimil”, “innerproduct”, “hammingbit”; default: “l2”

pre_filter: script_score query to pre-filter documents before identifying nearest neighbors; default: {“match_all”: {}}

Optional Args for Painless Scripting Search:

search_type: “painless_scripting”; default: “approximate_search”

space_type: “l2Squared”, “l1Norm”, “cosineSimilarity”; default: “l2Squared”

pre_filter: script_score query to pre-filter documents before identifying nearest neighbors; default: {“match_all”: {}}

similarity_search_by_vector(embedding: List[float], k: int = 4, score_threshold: float | None = 0.0, **kwargs: Any) → List[Document][source]#

Return docs most similar to the embedding vector.

Parameters:

  • embedding (List[float])

  • k (int)

  • score_threshold (float | None)

  • kwargs (Any)

Return type:

List[Document]

similarity_search_with_relevance_scores(query: str, k: int = 4, **kwargs: Any) → list[tuple[Document, float]]#

Return docs and relevance scores in the range [0, 1].

0 is dissimilar, 1 is most similar.

Parameters:

  • query (str) – Input text.

  • k (int) – Number of Documents to return. Defaults to 4.

  • **kwargs (Any) –

    kwargs to be passed to similarity search. Should include: score_threshold: Optional, a floating point value between 0 to 1 to

    filter the resulting set of retrieved docs.

Returns:

List of Tuples of (doc, similarity_score).

Return type:

list[tuple[Document, float]]

similarity_search_with_score(query: str, k: int = 4, score_threshold: float | None = 0.0, **kwargs: Any) → List[Tuple[Document, float]][source]#

Return docs and it’s scores most similar to query.

By default, supports Approximate Search. Also supports Script Scoring and Painless Scripting.

Parameters:

  • query (str) – Text to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • score_threshold (float | None) – Specify a score threshold to return only documents

  • 0.0. (above the threshold. Defaults to)

  • kwargs (Any)

Returns:

List of Documents along with its scores most similar to the query.

Return type:

List[Tuple[Document, float]]

Optional Args:

same as similarity_search

similarity_search_with_score_by_vector(embedding: List[float], k: int = 4, score_threshold: float | None = 0.0, **kwargs: Any) → List[Tuple[Document, float]][source]#

Return docs and it’s scores most similar to the embedding vector.

By default, supports Approximate Search. Also supports Script Scoring and Painless Scripting.

Parameters:

  • embedding (List[float]) – Embedding vector to look up documents similar to.

  • k (int) – Number of Documents to return. Defaults to 4.

  • score_threshold (float | None) – Specify a score threshold to return only documents

  • 0.0. (above the threshold. Defaults to)

  • kwargs (Any)

Returns:

List of Documents along with its scores most similar to the query.

Return type:

List[Tuple[Document, float]]

Optional Args:

same as similarity_search

Examples using OpenSearchVectorSearch

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