A critical release has been published for the Drupal 7 platform upstream which updates the Pantheon Apache Solr module to version 7.x-1.1.
This update adjusts the connection between the Drupal 7 and Pantheon's Solr service. This change is required as part of platform security improvements that will affect a site's ability to access the Solr service.
Action Required: Customers using Solr with Drupal 7 sites should update their sites to the latest version of the upstream as soon as possible. Customers with custom upstreams will need to update their upstreams to include the last changes in the platform upstream.
Starting June 17, 2025, Pantheon will require the updated Pantheon Apache Solr module (provided in the Pantheon Drupal 7 upstream) for Drupal 7 sites to access Solr services. Sites running on older versions of the Drupal 7 upstream (with pantheon_apachesolr version 7.x-1.0 or below) will no longer be able to access Pantheon's Solr services.