Update instructions for Apache SOLR

docs/drupal/apache-solr.md

@@ -10,10 +10,36 @@ We run Apache Solr on `localhost:8983` with a default Drupal schema that is work
 Probo has two cores installed. One for Drupal 7, and one for Drupal 8 & 9. The cores are intuitively named `drupal7` and `drupal8`. Note that there is no third core for Drupal 9 as it can use the same as Drupal 8. Below are the current schema versions installed for each version: 
 
 Drupal 7: 7.x-1.15  
-Drupal 8/9: 4.1.10  
+Drupal 8/9: 4.2.0  
 
-We will periodically update these and communicate these changes as new versions of these modules are released.  
+We will periodically update these and communicate these changes as new versions of these modules are released. Build images are typically updated the first weekend of every month. Please follow the [Changelog](/changelog) for information on specific updates. You can also get the current versions of things in the image by referencing the [Docker Images Page](/build/images/) in the section on `versionizer`.  
 
-If you are using [Search API](https://www.drupal.org/project/search_api), your SOLR settings should look like as per the following example. Note you would substitute `drupal8` with `drupal7` for Drupal 7 sites.
+The easiest way to integrate SOLR into your **Drupal 8/9** site is to append the following information to the [Drupal Plugin](https://docs.probo.ci/plugins/drupal-plugin/) as part of your `settingsAppend` configuration:  
+
+```yaml
+steps:
+  - name: Install and Update Drupal
+    plugin: Drupal
+    database: drupal-database.sql.gz
+    databaseGzipped: true
+    databaseUpdates: true
+    clearCaches: true
+    drupalVersion: 8
+    settingsAppend: |
+      $config['search_api.server.solr']['backend_config']['connector_config']['host'] = 'localhost';
+      $config['search_api.server.solr']['backend_config']['connector_config']['core'] = 'drupal8';
+```
+
+If you choose not to use the settingsAppend solution, your SOLR settings inside your Probo build need to look as follows:  
 
 <img src='/images/solr.png' alt="SAPI configuration">
+
+Additionally you can automatically import into SOLR using Drush:  
+
+```yaml
+  - name: Clear SOLR Index
+    command: drush -r /var/www/html sapi-r -y
+
+  - name: Index SOLR
+    command: drush -r /var/www/html sapi-i --batch-size=100 -y
+```