Make more page providers use Elasticsearch by default

The following page providers are doing fulltext search and should use Elasticsearch instead of repository searches:

• simple_search
• document_content
• section_content
• document_trash_content
• orderable_document_content

Beyond performance reasons, this is needed because we want to removing fulltext search capability from our H2 SQL backend (because it's too complex to maintain) (see NXP-29173).