Release Notes
We added External Reference Codes for Categories and Tags and their associated API’s, improving their portability for data migration scenarios.
Highlights:
Users can now perform CRUD operations using a Tag’s ERC through its headless API (Keyword)
Users can now perform CRUD operations using a Category’s ERC through its headless API (TaxonomyCategory)
We added several API endpoints for Documents & Media to improve programmatic management of these entities.
Highlights:
Users can now add, delete, and retrieve document types via headless API (DocumentDataDefinitionType)
Users can now add, delete, and retrieve document metadata sets via headless API (DocumentMetadataSet)
Elasticsearch 8.17 has been tested and added to the compatibility matrix.
Liferay Self-Hosted deployments can update the Elastic stack to this version. For Liferay PaaS projects, as usual, a new Elasticsearch image will be provided under Liferay Cloud’s Docker Hub account.
As it was first highlighted in the Release Notes of 2024.Q3, per Elastic’s product lifecycle, Elasticsearch 7.17.x versions are supported and maintained until Elasticsearch version 9 is released.
While Elastic does not provide specific release dates for future releases, for Elasticsearch 9.0.0, the new release is anticipated in early calendar year 2025.
Compatibility with Elasticsearch 8 is available on Liferay DXP 7.4 U81+: 
Note: The Elasticsearch 8.x compatibility is provided through the bundled Elasticsearch 7 connector and the REST API Compatibility of Elasticsearch 8.
The Marketplace release of the Liferay Connector to OpenSearch 2 provides an alternative to Elasticsearch for Self-Hosted Liferay deployments.
This connector integrates Liferay DXP with OpenSearch 2.12+, the open source and enterprise grade search engine. OpenSearch offers lexical search for text data, robust scalability and extensibility, and vector search for applications using embeddings, such as Liferay's Semantic Search.
The installation of this app requires specific configurations covered in the official documentation. For detailed compatibility information, see the Search Engine Compatibility Matrix.
The OpenSearch integration is currently a Beta feature with the intention to make it GA in the future.