Rework Drupal 9 + SOLR guide

[AnouckColson]

Where on docs.platform.sh should be changed?

https://docs.platform.sh/guides/drupal9/solr.html

What exactly should be updated?

The procedure seems to be outdated & the whole page needs to be reworked to fit our styleguide.

Additional context

No response

[gilzow]

We discovered, at a minimum, Step 5, JTS should be set to false

[gilzow]

Just had another customer message me with questions regarding SOLR and Drupal.

Our guide is definitely out-of-date. Given customers are still referencing it and then running into issues, should we take it down until we can get it updated?

[chadwcarlson]

Recapping what was in Linear:

• archived version of guide: https://web.archive.org/web/20230726024625/https://docs.platform.sh/guides/drupal9/solr.html
• From internal chat/community member, getting Solr connection working in settings.platformsh.php:

I connected using the ddev docs locally, and configured the solr relationship using platforms documentation https://docs.platform.sh/add-services/solr.html#use-in-app - Then I added this to settings:

// Configure Solr
if ($platformsh->hasRelationship('solrsearch')) {
  $solrCreds = $platformsh->credentials('solrsearch');
  $config['search_api.server.solr']['backend_config']['connector'] = 'standard';
  $config['search_api.server.solr']['backend_config']['connector_config']['host'] = $solrCreds['host'];
  $config['search_api.server.solr']['backend_config']['connector_config']['path'] = '/';
  $config['search_api.server.solr']['backend_config']['connector_config']['port'] = $solrCreds['port'];
  $config['search_api.server.solr']['backend_config']['connector_config']['scheme'] = 'http';
  $config['search_api.server.solr']['backend_config']['connector_config']['username'] = $solrCreds['username'];
  $config['search_api.server.solr']['backend_config']['connector_config']['password'] = $solrCreds['password'];
}