You may see the error below on `/admin/config/search/search-api/index/acquia_search_index`:
Solr core authentication check fails
Follow these steps to resolve the error:
- Check the Acquia Connector module version using the drush below or at the `/admin/modules` path in your website.
@app.env drush -l site pml | grep acquia_connector
- If the output version is 8.x-1.20 or less, upgrade to the most recent stable version.
- Once it is upgraded, connect Acquia Connector to your site.