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To add solr, reference https://github.com/kalamuna/kalastack/wiki/Adding-Solr-to-Kalastack
Drupal Configuration
- Enable Pantheon Solr module
- Visit `admin/config/search/pantheon_solr`
- Turn on `3.x/schema.xml` schema
- Mark for reindex with `drush @pantheon.%site%.%env% --strict=0 search-api-reindex`
- Do the indexing with `drush @pantheon.%site%.%env% --strict=0 search-api-index`