TC.K

Ultimate WP Query Search Filter is a powerful search engine that lets your users perform more precise searches by filtering the search through post types, taxonomies and meta fields. The search result can be displayed either through the theme search template or an Ajax call.
Plugin Features:
<ul>
<li>Admins are free to choose whether the search filters post type, taxonomy, meta field or even all three.</li>
<li>Multiple search forms supported.</li>
<li>Free to choose either theme search template or Ajax call to display the result for each of the search forms.</li>
<li>Search forms support checkbox, radio and select fields.</li>
<li>Plugin extendable with hooks.</li>
<li>The search form can be displayed via shortcode.</li>
</ul>
If you have any problems with the current plugin, please leave a message via support forum post or go <a href="http://9-sec.com/support-forum/" rel="nofollow ugc">Here</a> to visit the 9-SEC forum.

Ultimate WP Query Search Filter

Just what i was looking for

Surprisingly the plugin still does what it says.

to tget arround an install error i had to change in ultimate-wpqsf.php Line 126 

= '';
to
= [];

tons of filters let me adapt the bit outdated html markup

Pretty good if you know what you do

Ultimate WP Query Search Filter lets you filter searches through post types, taxonomies and meta fields. Results displayed via search template or Ajax …

THIS PLUGIN WILL NOT BE UPDATE ANYMORE, PLEASE USE MY NEW PLUGN <a href="https://wordpress.org/plugins/ultimate-wp-query-search-filter/" rel="ugc">ULTIMATE WP QUERY SEARCH QUERY</a> INSTEAD
This plugin is an upgraded version of WP_Query Search Filter with added a lot of features. In nutshell Advance WP_Query Search Filter let your user perform more precisely search by filtering the search through post type, taxonomy and meta field. Ideal for website that have multiple post types, taxonomies and meta fields, eg property website, product website etc.
Plugin Features:
<ul>
<li>Admin are free to choose whether the search go through post type, taxonomy, meta field or even all of them.</li>
<li>Multiple Search Form Supported.</li>
<li>Search form now support checkbox,radio and dropdown fields.</li>
<li>Using wp search template to disply the result.</li>
<li>Admin can define how many result per page.</li>
<li>Admin can sorting the result page by meta key and meta value.</li>
<li>Using shortcode to display the search form.</li>
</ul>
If you have any problems with current plugin, please leave a 
message on Forums Posts or goto <a href="http://9-sec.com/2013/03/advance-wp-query-search-filter/" rel="nofollow ugc">Here</a>.

Advance WP Query Search Filter

Advance WP Query Search Filter let you search through post type, taxonomy and meta field.

Ultimate WP Query Search Filter vs Advance WP Query Search Filter