jamesdlow

Relevanssi now has this functionality built in. Please upgrade your Relevanssi and remove this one.
Relevanssi has the ability to build the index in a step wise fashion (by default 500 posts at a time). However if you have a larger number of posts you can be stuck clicking the “Continue Indexing” button over and over again.
Step Index adds a small peice of JavaScript that will do this process automatically for you if you check the “Step Index” checkbox before clicking “Continue Indexing”.

Step Index For relevanssi

Relevanssi now has this functionality built in. Please upgrade your Relevanssi and remove this one.

jojaba

This plugin is meant to add the word autocomplete in search input field by using the index stored in Relevanssi database. So you have to <a href="https://wordpress.org/plugins/relevanssi/" rel="ugc">install first Relevanssi</a> (free or premium version) to have it to work.
The JS script used to accomplish the autocompletion work has been developed by <a href="http://lea.verou.me/" rel="nofollow ugc">Lea Verou</a> and is called <a href="https://leaverou.github.io/awesomplete" title="Go to the Awesomplete homepage" rel="nofollow ugc">Awesomplete</a>. It is very simple to set up, lightweight and accessible.
<h4>List of functionalities</h4>
<ul>
<li>Settings available: styling, min characters typed to show the autocompletion box, max suggestions in autocompletion box.</li>
<li>Get the Relevanssi Indexed words to have the autcompletion list</li>
<li>Fast and lightweight</li>
<li>English and french languages included</li>
</ul>

Autocomplete For Relevanssi

Relevanssi author here. Please do not use this plugin in its current form. It's dangerous for performance and may cause server crashes. It will also slow down page loads in a rather terrifying manner.

Dangerous, do not use

Autocompletion functionality for WordPress search input when Relevanssi plugin is installed.

Step Index For relevanssi vs Autocomplete For Relevanssi