Package dev.langchain4j.store.embedding.elasticsearch

Class ElasticsearchEmbeddingStore

java.lang.Object

dev.langchain4j.store.embedding.elasticsearch.ElasticsearchEmbeddingStore

All Implemented Interfaces:

EmbeddingStore<TextSegment>

public class ElasticsearchEmbeddingStore
extends Object
implements EmbeddingStore<TextSegment>

Represents an Elasticsearch index as an embedding store.

See Also:

• for the exact brute force implementation (slower - 100% accurate)
• for the knn search implementation (faster - approximative)
Supports storing Metadata and filtering by it using Filter (provided inside EmbeddingSearchRequest).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ElasticsearchEmbeddingStore.Builder

Constructor Summary

Constructors

Constructor	Description
ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration, String serverUrl, String apiKey, String userName, String password, String indexName)	Deprecated, for removal: This API element is subject to removal in a future version. by ElasticsearchEmbeddingStore(ElasticsearchConfiguration, RestClient, String)
ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration, String serverUrl, String apiKey, String userName, String password, String indexName, Integer dimension)	Deprecated, for removal: This API element is subject to removal in a future version. by ElasticsearchEmbeddingStore(ElasticsearchConfiguration, RestClient, String)
ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration, org.elasticsearch.client.RestClient restClient, String indexName)	Constructor using a RestClient

Method Summary

Modifier and Type	Method	Description
String	add(Embedding embedding)	Adds a given embedding to the store.
String	add(Embedding embedding, TextSegment textSegment)	Adds a given embedding and the corresponding content that has been embedded to the store.
void	add(String id, Embedding embedding)	Adds a given embedding to the store.
List<String>	addAll(List<Embedding> embeddings)	Adds multiple embeddings to the store.
void	addAll(List<String> ids, List<Embedding> embeddings, List<TextSegment> embedded)	Adds multiple embeddings and their corresponding contents that have been embedded to the store.
static ElasticsearchEmbeddingStore.Builder	builder()
void	removeAll()	The Elasticsearch implementation will simply drop the index instead of removing all documents one by one.
void	removeAll(Filter filter)	Removes all embeddings that match the specified Filter from the store.
void	removeAll(Collection<String> ids)	Removes all embeddings that match the specified IDs from the store.
EmbeddingSearchResult<TextSegment>	search(EmbeddingSearchRequest embeddingSearchRequest)	Searches for the most similar (closest in the embedding space) Embeddings.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface dev.langchain4j.store.embedding.EmbeddingStore

addAll, findRelevant, findRelevant, findRelevant, findRelevant, generateIds, remove

Constructor Details

ElasticsearchEmbeddingStore

@Deprecated(forRemoval=true)
public ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration,
 String serverUrl,
 String apiKey,
 String userName,
 String password,
 String indexName,
 Integer dimension)

Deprecated, for removal: This API element is subject to removal in a future version.

by ElasticsearchEmbeddingStore(ElasticsearchConfiguration, RestClient, String)

Creates an instance of ElasticsearchEmbeddingStore.

Parameters:

configuration - Elasticsearch configuration to use (Knn or Script)

serverUrl - Elasticsearch Server URL (mandatory)

apiKey - Elasticsearch API key (optional)

userName - Elasticsearch userName (optional)

password - Elasticsearch password (optional)

indexName - Elasticsearch index name (optional). Default value: "default". Index will be created automatically if not exists.

dimension - Embedding vector dimension (mandatory when index does not exist yet).

ElasticsearchEmbeddingStore

@Deprecated(forRemoval=true)
public ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration,
 String serverUrl,
 String apiKey,
 String userName,
 String password,
 String indexName)

Deprecated, for removal: This API element is subject to removal in a future version.

by ElasticsearchEmbeddingStore(ElasticsearchConfiguration, RestClient, String)

Creates an instance of ElasticsearchEmbeddingStore.

Parameters:

configuration - Elasticsearch configuration to use (Knn or Script)

serverUrl - Elasticsearch Server URL (mandatory)

apiKey - Elasticsearch API key (optional)

userName - Elasticsearch userName (optional)

password - Elasticsearch password (optional)

indexName - Elasticsearch index name (optional). Default value: "default". Index will be created automatically if not exists.

ElasticsearchEmbeddingStore

public ElasticsearchEmbeddingStore(ElasticsearchConfiguration configuration,
 org.elasticsearch.client.RestClient restClient,
 String indexName)

Constructor using a RestClient

Parameters:

configuration - Elasticsearch configuration to use (Knn or Script)

restClient - Elasticsearch Rest Client (mandatory)

indexName - Elasticsearch index name (optional). Default value: "default". Index will be created automatically if not exists.

Method Details

builder

public static ElasticsearchEmbeddingStore.Builder builder()

add

public String add(Embedding embedding)

Description copied from interface: EmbeddingStore

Adds a given embedding to the store.

Specified by:

add in interface EmbeddingStore<TextSegment>

Parameters:

embedding - The embedding to be added to the store.

Returns:

The auto-generated ID associated with the added embedding.

add

public void add(String id,
 Embedding embedding)

Description copied from interface: EmbeddingStore

Adds a given embedding to the store.

Specified by:

add in interface EmbeddingStore<TextSegment>

Parameters:

id - The unique identifier for the embedding to be added.

embedding - The embedding to be added to the store.

add

public String add(Embedding embedding,
 TextSegment textSegment)

Description copied from interface: EmbeddingStore

Adds a given embedding and the corresponding content that has been embedded to the store.

Specified by:

add in interface EmbeddingStore<TextSegment>

Parameters:

embedding - The embedding to be added to the store.

textSegment - Original content that was embedded.

Returns:

The auto-generated ID associated with the added embedding.

addAll

public List<String> addAll(List<Embedding> embeddings)

Description copied from interface: EmbeddingStore

Adds multiple embeddings to the store.

Specified by:

addAll in interface EmbeddingStore<TextSegment>

Parameters:

embeddings - A list of embeddings to be added to the store.

Returns:

A list of auto-generated IDs associated with the added embeddings.

search

public EmbeddingSearchResult<TextSegment> search(EmbeddingSearchRequest embeddingSearchRequest)

Description copied from interface: EmbeddingStore

Searches for the most similar (closest in the embedding space) Embeddings.
All search criteria are defined inside the EmbeddingSearchRequest.
EmbeddingSearchRequest.filter() can be used to filter by various metadata entries (e.g., user/memory ID). Please note that not all EmbeddingStore implementations support Filtering.

Specified by:

search in interface EmbeddingStore<TextSegment>

Parameters:

embeddingSearchRequest - A request to search in an EmbeddingStore. Contains all search criteria.

Returns:

An EmbeddingSearchResult containing all found Embeddings.

removeAll

public void removeAll(Collection<String> ids)

Description copied from interface: EmbeddingStore

Removes all embeddings that match the specified IDs from the store.

Specified by:

removeAll in interface EmbeddingStore<TextSegment>

Parameters:

ids - A collection of unique IDs of the embeddings to be removed.

removeAll

public void removeAll(Filter filter)

Description copied from interface: EmbeddingStore

Removes all embeddings that match the specified Filter from the store.

Specified by:

removeAll in interface EmbeddingStore<TextSegment>

Parameters:

filter - The filter to be applied to the Metadata of the TextSegment during removal. Only embeddings whose TextSegment's Metadata match the Filter will be removed.

removeAll

public void removeAll()

The Elasticsearch implementation will simply drop the index instead of removing all documents one by one.

Specified by:

removeAll in interface EmbeddingStore<TextSegment>

addAll

public void addAll(List<String> ids,
 List<Embedding> embeddings,
 List<TextSegment> embedded)

Description copied from interface: EmbeddingStore

Adds multiple embeddings and their corresponding contents that have been embedded to the store.

Specified by:

addAll in interface EmbeddingStore<TextSegment>

Parameters:

ids - A list of IDs associated with the added embeddings.

embeddings - A list of embeddings to be added to the store.

embedded - A list of original contents that were embedded.