horike

We adopted the Elasticsearch to search engine. You can also search, such as post title, post content, custom fields by replacing the WordPress of standard search function. The accuracy of the search feature dramatically improves in WordPress.
<h4>Setting</h4>
<ul>
<li>In the <a href="https://wordpress.org/plugins/wp-simple-elasticsearch/screenshots/" rel="ugc">screenshoot section</a> you can look on the first screenshot. </li>
<li>Require setting to <code>Elasticsearch Endpoint</code>,<code>Port</code>,<code>index</code>,<code>type</code> and push <code>Save Changes</code>. It is default search target <code>post title</code>, <code>post content</code>.</li>
<li>Please push <code>Post Data sync to Elasticsearch</code>. So Posts data are sent to Elasticsearch.</li>
</ul>

WP Simple Elasticsearch

This plugin is that WordPress of standard search using ?s=xxx to replace WordPress DB with Elasticsearch.

Nima Shayanfar

Bushwack Studio

ElasticProbe, a fast and flexible search and query engine for WordPress, enables WordPress to find or “query” relevant content extremely fast through a variety of highly customizable features. WordPress out-of-the-box struggles to analyze content relevancy and can be very slow. ElasticProbe supercharges your WordPress website making for more sales, happier users and administrators. The plugin even contains many features.
Here is a list of the amazing ElasticProbe features included in the plugin:
Search: Instantly find the content you’re looking for. Even when you misspell.
Instant Results: A built for WordPress search experience that bypasses WordPress for optimal performance. Instant Results routes search queries through a dedicated API, separate from WordPress which results in lightning fast search experience.
WooCommerce: With ElasticProbe, filtering WooCommerce product results is fast and easy. Your customers can find and buy exactly what they’re looking for, even if you have a large or complex product catalog.
Related Posts: ElasticProbe understands data in real time, so it can instantly deliver engaging and precise related content with no impact on site performance.
Protected Content: Optionally index all of your content, including private and unpublished content, to speed up searches and queries in places like the administrative dashboard.
Documents: Indexes text inside of popular file types, and adds those files types to search results.
Autosuggest: Make (post, page or custom type) suggestion while user is typing in the search input.
Autocomplete: Complete the search query term while the user is typing.
Filters: Add controls to your website to filter content by one or more taxonomies.
Comments: Indexes your comments and provides a widget with type-ahead search functionality. It works with WooCommerce product reviews out-of-the-box.

ElasticProbe

A lightning fast and flexible search and query engine for WordPress.

WP Simple Elasticsearch vs ElasticProbe