George Gkouvousis

Simple, yet efficient plugin, in order to keep only posts in your search results. Pages, custom post types and every other type, will be excluded from your WordPress search queries.
Just upload the plugin and activate it. It will take take care of the rest.
* Keep in mind that this plugin works with the default WordPress search engine.

Remove Pages From Search

Tired of search for an one-click solutions for your search results? This plugin will exclude everything except posts from your website's search r …

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.

Remove Pages From Search vs Solr for WordPress