Relevanssi Premium GPL Overview:

WordPress search doesn’t search everything, and doesn’t give you enough control over what is searched and how. Relevanssi gives you full access and full control, with plenty of filters and ways to make Relevanssi work the way you want your search to work.

• PDF contents Relevanssi can read the text from your PDFs, index it and search it! Read more about indexing PDFs.
• Multisite searches Relevanssi can run searches across many subsites in the same multisite network.
• Custom fields Relevanssi will find the content in your custom fields, including things like WooCommerce SKUs, ACF field content or whatever it is you store in custom fields. Read more about custom field search.
• User profiles Yes, Relevanssi will find users by their names and profile descriptions.
• Taxonomy terms No matter if you prefer categories, tags or custom taxonomies, Relevanssi will return the term archive pages in searches!
• Shortcode output Relevanssi can expand shortcodes and find content generated by shortcodes.

PREMIUM FEATURES (ONLY IN RELEVANSSI PREMIUM)

• Indexing attachment content (PDF, Office, Open Office).
• Improved spelling correction in “Did you mean?” suggestions.
• Searching across multiple sites in the same multisite installation.
• Search and index user profiles.
• Search and index taxonomy term pages (categories, tags, custom taxonomies).
• Search and index arbitrary columns in wp_posts MySQL table.
• Assign weights to any post types and taxonomies.
• Assign extra weight to new posts.
• Let the user choose between AND and OR searches, use and – operator (AND and NOT).
• Export and import settings.
• WP CLI commands.
• Related posts.
• Redirects for searches.

ADVANCED FEATURES

• Adjust the weighting for titles, tags and comments.
• Log queries, show most popular queries and recent queries with no hits.
• Restrict searches to categories and tags using a hidden variable or plugin settings.
• Index custom post types and custom taxonomies.
• Index the contents of shortcodes.
• Google-style “Did you mean?” suggestions based on successful user searches.
• Support for WPML multi-language plugin and Polylang.
• Support for s2member membership plugin, Members, Groups, Simple Membership and other membership plugins.
• Advanced filtering to help hacking the search results the way you want.
• Search result throttling to improve performance on large databases.
• Disable indexing of post content and post titles with a simple filter hook.