Pantheon Search now supports Apache Solr 9.10.0 as a Beta for Drupal 10 and 11 sites. This is available through search_api_pantheon version 8.5.0-beta1, which supports both Solr 8 and Solr 9.
What's new?
- Added Solr 9 support.
- Solr 9 brings improved security defaults, the unified highlighter, and other enhancements. See the major changes in Solr 9 for details.
- Bumped Search API Solr version requirement to 4.3.x.
Getting started with Solr 9 (Beta)
Upgrading from Solr 8 to Solr 9
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Update the module:
Commit and deploy the changes to your Pantheon environment.
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Update your
pantheon.yml:Commit and deploy the changes to your Pantheon environment.
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Clear the cache:
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Post the schema for the new Solr version:
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Clear the index and reindex content:
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Test search functionality thoroughly and report any issues in the drupal.org issue queue.
New installations
To try the Beta with Solr 9 on a new site, set the Solr version in your pantheon.yml and install the module:
For detailed setup steps, see the documentation.
What about Solr 8?
Solr 8 (8.11.4) remains fully supported. Existing Solr 8 sites can update to Search API Pantheon 8.5.x without any configuration changes.
Older Drupal versions
Pantheon Search is no longer supported for Drupal 8-9.3 as of December 2, 2025.
Solr 3 is no longer supported by Drupal 9.4+ as of December 9, 2025. Those sites must use Solr 8 or above.
Feedback and documentation
Bug reports, feature requests, and feedback should be posted in the drupal.org issue queue. For detailed installation and upgrade instructions,Pantheon Search documentation.