With Magento 2.4.9 (GA on 12 May 2026) comes support for OpenSearch 3.x, while still keeping backward compatibility with 2.x. The search engine is a core component of the store: it is worth understanding what changes and how to upgrade it safely.

The role of the search engine in Magento

In Magento, catalog search does not only power the storefront search bar: it also feeds category pages, layered navigation filters and sorting by relevance. OpenSearch indexes products and attributes and responds in a few milliseconds even on large catalogs. A poorly configured engine means customers struggle to find products — with a direct impact on conversions.

What OpenSearch 3.x brings

• Performance: faster queries and lower resource usage on large catalogs and high traffic.
• Security: updated dependencies and more recent patches than 2.x.
• Long-term support: aligning the store with 3.x avoids staying on a line heading for end of life.

Migrating from 2.x

The good news is that 2.4.9 stays backward compatible: you can upgrade Magento first and the engine later, without doing everything at once. The recommended path:

• Check your current OpenSearch version and your infrastructure requirements.
• Install OpenSearch 3.x on a dedicated node (or upgrade the existing cluster).
• Update the endpoint and credentials in the Magento configuration.

Reindexing

After switching engines you must reindex the catalog search: previous indices are not reused. Run bin/magento indexer:reindex catalogsearch_fulltext (or a full reindex) and flush the cache. On large catalogs, schedule the operation in a low-traffic window.

Admin configuration

In Stores → Configuration → Catalog → Catalog Search set the engine to OpenSearch 3.x, the hostname, the port, the index prefix and any authentication. Use the Test Connection button to validate the endpoint before saving.

Impact on search, filters and relevance

Moving to 3.x does not change the basic functional behaviour, but it is the right moment to review attribute weights, synonyms and relevance: small scoring differences can shift results. Also check that layered navigation filters show the correct counts after the reindex.

Always test on staging

Before touching production, replicate the upgrade on a staging environment: compare search results, filters and response times with the current ones. Only after validating everything should you push the change live. Need a hand planning the migration to OpenSearch 3.x? The Shine Software team is here to help.