Version 4.1 adds couple of new features: you can do searches in the admin using the full power of Relevanssi, and you can export the Relevanssi search logs as a CSV file.

The admin search is very much a work-in-progress; any feedback is welcome.

Changelog

• New feature: You can now export the search log as a CSV file.
• New feature: Admin Search page allows you to perform searches in WP admin using Relevanssi.
• New filter: relevanssi_admin_search_capability can be used to adjust who sees the admin search page.
• New filter: relevanssi_entities_inside_pre and relevanssi_entities_inside_code adjust how HTML entities are handled inside pre and code tags.
• Numeric meta values (meta_value_num) are now sorted as numbers and not strings.
• Pinned posts have $post->relevanssi_pinned set to 1 for debugging purposes, but you can also use this for styling the posts in the search results templates.
• The Did you mean feature has been toned down a bit, to make the suggestions slightly less weird in some cases.
• Post parent parameters now accept 0 as a value, making it easier to search for children of any post or posts without a parent.
• Polylang compatibility has been improved.
• Phrases with apostrophes inside work better.
• The relevanssi_excerpt filter hook got a second parameter that holds the post ID.
• Custom field sorting actually works now.
• WP Search Suggest compatibility added.

You can get the latest version from the plugin repository.