opensolr

Opensolr Search replaces WordPress’s default search with a powerful, hosted Apache Solr search engine. It combines traditional keyword search with AI-powered vector search for dramatically better relevance.
Key Features:
<ul>
<li>Hybrid Search — combines keyword matching (BM25) with semantic vector search (1024-dim embeddings) for the best of both worlds</li>
<li>Faceted Navigation — filter results by category, price range, date, custom fields, and hierarchical taxonomies</li>
<li>AI Hints — streaming AI-generated answers above search results, powered by RAG</li>
<li>AI Reader — full-screen AI summary of any search result</li>
<li>Autocomplete — real-time search suggestions with query history and Solr results</li>
<li>WooCommerce Support — index products with prices, categories, SKUs, and structured data</li>
<li>Two Indexing Methods — Web Crawler (automatic) and Data Ingestion API (push from WordPress)</li>
<li>Search Analytics — track queries, clicks, CTR, no-results queries, and visitor patterns</li>
<li>Query Elevation — pin or exclude specific results for any query</li>
<li>Persistent Filters — admin-defined include/exclude filters applied to every search</li>
<li>Multilingual — automatic locale filtering for WPML and Polylang sites</li>
<li>Dark Theme — built-in dark mode for the search page</li>
<li>Embeddable — use native search or embed the Opensolr hosted search widget</li>
</ul>
How It Works:
<ol>
<li>Sign up at <a href="https://opensolr.com" rel="nofollow ugc">opensolr.com</a> and get your API key</li>
<li>Install the plugin and enter your credentials</li>
<li>Create a search index or connect to an existing one</li>
<li>Configure your sitemap and start the web crawler</li>
<li>Your search page is live at <code>/opensolr-search</code></li>
</ol>
The plugin generates a complete sitemap, injects meta tags for the crawler to extract, and provides a full search experience with zero load on your WordPress server — all search queries go directly to the Opensolr cloud.
Requirements:
<ul>
<li>An Opensolr account (free tier available)</li>
<li>PHP 8.1 or higher</li>
<li>WordPress 6.0 or higher</li>
</ul>
<h3>External services</h3>
This plugin depends on several online services operated by Opensolr (<a href="https://opensolr.com" rel="nofollow ugc">https://opensolr.com</a>) to provide hosted search. You must have an Opensolr account; all indexing and search queries flow through these services. The service is required for core plugin functionality and cannot be self-hosted.
Service provider
<ul>
<li>Opensolr — hosted Solr search cloud and AI API</li>
<li>Privacy policy: <a href="https://opensolr.com/learn/privacy-policy" rel="nofollow ugc">https://opensolr.com/learn/privacy-policy</a></li>
<li>Terms of service: <a href="https://opensolr.com/learn/terms-of-service" rel="nofollow ugc">https://opensolr.com/learn/terms-of-service</a></li>
<li>Account signup (free tier available): <a href="https://opensolr.com/register" rel="nofollow ugc">https://opensolr.com/register</a></li>
</ul>
Endpoints the plugin contacts
<ul>
<li><code>https://opensolr.com/solr_manager/api/*</code> — account management, index create/reload, config upload, sitemap registration, elevation toggle, crawl start/stop/stats. Called from WordPress admin (not from visitors’ browsers).</li>
<li><code>https://api.opensolr.com/solr_manager/api/ingest</code> — Data Ingestion API: pushes your post content + metadata to the search index. Called from the WordPress site (cron worker and the real-time sync on post save/delete), never from visitors.</li>
<li><code>https://api.opensolr.com/solr_manager/api/embed</code> — generates a 1024-dim semantic embedding for the current search query (AI/hybrid search path only). Called from the WordPress site on every AI/hybrid search.</li>
<li><code>https://api.opensolr.com/solr_manager/api/ai_summary</code> — streams the AI Hints / AI Reader answer. Called from the WordPress site only when the admin has enabled those features.</li>
<li><code>https://<your-solr-host>.solrcluster.com/solr/<your-index>/select</code> — the Solr search request itself (host provided by Opensolr when you create an index). Called from the WordPress site on every search.</li>
<li><code>https://search.opensolr.com/embed.js</code> — loaded ONLY if the admin switches Search Mode to “Embeddable”. In Native mode (the default), this script is never loaded.</li>
</ul>
Data sent to these services
<ul>
<li>Your Opensolr email + API key (authentication).</li>
<li>Your site’s host name (<code>meta_domain</code>).</li>
<li>For ingestion: post titles, content, URL, excerpt, author display name, taxonomy terms, publish dates, WooCommerce price + category + SKU, featured-image URL. Only for the post types you explicitly enable in the plugin settings. Never includes user login data, email addresses, or passwords.</li>
<li>For search: the search query string, the active facet filters, pagination position.</li>
<li>For AI features (when enabled): the search query plus the top 4 result snippets, so the AI can compose an answer from your own content.</li>
<li>For click tracking (when enabled): the clicked result URL, title, position, the search query, and a SHA-256 hash of the visitor’s IP (never the raw IP). Analytics can be disabled from the plugin’s Search Display settings.</li>
</ul>
No data is shared with any third party — all traffic goes only to <code>opensolr.com</code> / <code>api.opensolr.com</code> / <code>*.solrcluster.com</code> (and only to <code>search.opensolr.com</code> if you explicitly enable Embeddable mode).

Opensolr Search

Powerful hybrid vector + keyword search powered by Opensolr. AI-powered search, faceted navigation, autocomplete, analytics, and WooCommerce support.

mattweber

A WordPress plugin that replaces the default WordPress search with Solr. Features include:
<ul>
<li>Index pages and posts</li>
<li>Enable faceting on fields such as tags, categories, author, and page type.</li>
<li>Indexing and faceting on custom fields</li>
<li>Multisite support</li>
<li>Treat the category facet as a taxonomy</li>
<li>Add special template tags so you can create your own custom result pages to match your theme.</li>
<li>Completely replaces default WordPress search, just install and configure.</li>
<li>Completely integrated into default WordPress theme and search widget.</li>
<li>Configuration options allow you to select pages to ignore, features to enable/disable, and what type of result information you want output.</li>
<li>i18n Support</li>
<li>
Multi server/core support
Note that this plugin requires you to have an instance of Solr using a schema with the following fields: id, permalink, title, content, numcomments, categories, categoriessrch, tags, tagssrch, author, type, and text. The facet fields (categories, tags, author, and type) should be string fields. You can make tagssrch and categoriessrch of any type you want as they are used for general searching. The plugin is distributed with a Solr schema you can use at <code>solr-for-wordpress/schema.xml</code>.
</li>
</ul>
<h3>Credits</h3>
Dominique Bejean for custom field support and testing. 
Eric Pugh multi server support. 
Dustin Rue – fixes for batch import and multisite.

Solr for WordPress

A WordPress plugin that replaces the default WordPress search with Solr.

Opensolr Search vs Solr for WordPress