wowpress.host

Default WordPress search result pages are often slow and results they show are often not relevant. This plugin use specially designed Search Engine software for that purpose, which gives you both speed and relevance.
Useful when:
<ul>
<li>You need your search results to be fast</li>
<li>better accuracy for search results required</li>
<li>natural language constructs has to be understood (search for “galaxy” has to return pages containing “galaxies” word)</li>
<li>drop-in replacement of existing search result pages – no adjustments in theme code required</li>
</ul>
At <a href="https://wowpress.host/" rel="nofollow ugc">WowPress.host</a> company we often face situation when search results pages at websites we manage are extremely slow, or search results you get are not relevant. Search pages traffic may even affect whole website stability by taking all SQL server resources. 
That happens because WordPress use SQL queries to perform the search but MySQL is not designed for that. There is only one working solution to prevent search slowness – use specially designed Search Engine server software written exactly for that purpose, and this plugin allows you to do that. 
This plugin supports ElasticSearch engine to perform search requests, and our service available in every hosting environment. 
Keep in mind that some technical knowledge required to set up and maintain ElasticSearch server software, also it’s not possible to install it on every hosting environment so we do offer our Managed service available for everyone.
While we offer our search solutions to our customers for awhile with a lot of success, we decided to publish some basic solution to the community for free since we use a lot of open-source tools in our work too. Hope it will help you.
<h4>Need Help? Found A Bug? Want To Contribute Code?</h4>
Support for this plugin is provided via the <a href="https://wordpress.org/support/plugin/wow-fulltext-search" rel="ugc">WordPress.org forums</a>.
The source code for this plugin is available on <a href="https://github.com/wowpress-host/wow-fulltext-search" rel="nofollow ugc">GitHub</a>.
Need adjustment for your specific theme/plugin needs? 
Paid support at <a href="https://wowpress.host/professional-services/" rel="nofollow ugc">WowPress.host</a>.

Wow FullText Search

Fast fulltext search provided by Search Engine software replacing default WordPress functionality.

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AlexandreT

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<h4>OpenSearchServer plugin</h4>
The OpenSearchServer Search Plugin enables <a href="http://www.opensearchserver.com/" rel="nofollow ugc">OpenSearchServer</a> full-text search in WordPress-based websites. 
OpenSearchServer is an high-performance search engine that includes spell-check, facets, filters, phonetic search, and auto-completion. 
This plugin automatically replaces the WordPress built-in search function.
<h4>Key Features</h4>
<ul>
<li>Full-text search with phonetic support,</li>
<li>Queries can be fully customized and the relevancy of each field (title, author, …) can be precisely tuned,</li>
<li>Search results can be filtered using facets,</li>
<li>Automatic search suggestions through autocompletion,</li>
<li>Spell-checking with automatic substitution,</li>
<li>Search into your files: .docx, .doc, .pdf, .rtf, etc. The plugin will extract text from your attachments and index it.</li>
<li>Automatic indexing of content as soon as it gets published, edited or deleted,</li>
<li>Can index and search through all type of content,</li>
<li>Can index and search every taxonomies,</li>
<li>Can be easily set up and tweaked through web form page</li>
<li>Supports multi-sites installation,</li>
<li>Supports a WPML plugin for translation,</li>
<li>Includes several filters and actions to allow for more customization via other plugins or themes.</li>
</ul>
See the screenshots page for more!

OpenSearchServer Search

The OpenSearchServer Search Plugin enables OpenSearchServer full-text search in WordPress-based websites.

Wow FullText Search vs OpenSearchServer Search