elasticsearch-js/docs/release-notes/index.md

navigation_title, mapped_pages

navigation_title	mapped_pages
Elasticsearch JavaScript Client	https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/changelog-client.html

Elasticsearch JavaScript Client release notes [elasticsearch-javascript-client-release-notes]

Review the changes, fixes, and more in each version of Elasticsearch JavaScript Client.

To check for security updates, go to Security announcements for the Elastic stack.

% Release notes include only features, enhancements, and fixes. Add breaking changes, deprecations, and known issues to the applicable release notes sections.

% ## version.next [elasticsearch-javascript-client-next-release-notes]

% Release date: Month day, year

% ### Features and enhancements [elasticsearch-javascript-client-next-features-enhancements]

% ### Fixes [elasticsearch-javascript-client-next-fixes]

9.0.0 [elasticsearch-javascript-client-900-release-notes]

Release date: April 8, 2025

Features and enhancements [elasticsearch-javascript-client-900-features-enhancements]

• Compatibility with Elasticsearch 9.0: All changes and additions to Elasticsearch APIs for its 9.0 release are reflected in this release.

• Serverless client merged in: the @elastic/elasticsearch-serverless client is being deprecated, and its functionality has been merged back into this client. This should have zero impact on the way the client works by default, except that a new serverMode option has been added. When it's explicitly set to "serverless" by a user, a few default settings and behaviors are changed:

  • turns off sniffing and ignores any sniffing-related options
  • ignores all nodes passed in config except the first one, and ignores any node filtering and selecting options
  • enables compression and TLSv1_2_method (same as when configured for Elastic Cloud)
  • adds an elastic-api-version HTTP header to all requests
  • uses CloudConnectionPool by default instead of WeightedConnectionPool
  • turns off vendored content-type and accept headers in favor or standard MIME types

  Docstrings for types that differ between stack and serverless have also been updated to indicate when that is the case.

• Improved Cloud ID parsing: when using a Cloud ID as the cloud parameter to instantiate the client, that ID was assumed to be in the correct format. New assertions have been added to verify that format and throw a ConfigurationError if it is invalid. See #2694.

% ### Fixes [elasticsearch-javascript-client-900-fixes]