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Elasticsearch Chat Message History

Elasticsearch is a distributed, RESTful search and analytics engine, capable of performing both vector and lexical search. It is built on top of the Apache Lucene library.

This notebook shows how to use chat message history functionality with Elasticsearch.

Set up Elasticsearch​

There are two main ways to set up an Elasticsearch instance:

  1. Elastic Cloud. Elastic Cloud is a managed Elasticsearch service. Sign up for a free trial.

  2. Local Elasticsearch installation. Get started with Elasticsearch by running it locally. The easiest way is to use the official Elasticsearch Docker image. See the Elasticsearch Docker documentation for more information.

Install dependencies​

%pip install elasticsearch langchain

Initialize Elasticsearch client and chat message history​

import os

from langchain.memory import ElasticsearchChatMessageHistory

es_url = os.environ.get("ES_URL", "http://localhost:9200")

# If using Elastic Cloud:
# es_cloud_id = os.environ.get("ES_CLOUD_ID")

# Note: see Authentication section for various authentication methods

history = ElasticsearchChatMessageHistory(
    es_url=es_url, index="test-history", session_id="test-session"
)

Use the chat message history​

history.add_user_message("hi!")
history.add_ai_message("whats up?")
    indexing message content='hi!' additional_kwargs={} example=False
    indexing message content='whats up?' additional_kwargs={} example=False

Authentication

Username/password​

es_username = os.environ.get("ES_USERNAME", "elastic")
es_password = os.environ.get("ES_PASSWORD", "changeme")

history = ElasticsearchChatMessageHistory(
    es_url=es_url,
    es_user=es_username,
    es_password=es_password,
    index="test-history",
    session_id="test-session"
)

How to obtain a password for the default "elastic" user​

To obtain your Elastic Cloud password for the default "elastic" user:

  1. Log in to the Elastic Cloud console at https://cloud.elastic.co
  2. Go to "Security" > "Users"
  3. Locate the "elastic" user and click "Edit"
  4. Click "Reset password"
  5. Follow the prompts to reset the password

API key​

es_api_key = os.environ.get("ES_API_KEY")

history = ElasticsearchChatMessageHistory(
    es_api_key=es_api_key,
    index="test-history",
    session_id="test-session"
)

How to obtain an API key​

To obtain an API key:

  1. Log in to the Elastic Cloud console at https://cloud.elastic.co
  2. Open Kibana and go to Stack Management > API Keys
  3. Click "Create API key"
  4. Enter a name for the API key and click "Create"