Algolia

This plugin provides Algolia integration for Moodle’s Global Search.
Algolia is a hosted Search as a Service provider making it easy for websites to integrate search without any need to install/maintain additional servers.
It currently offers a free plan with 10k records and 100k API calls per month.
Algolia is a hosted Search as a Service provider making it easy for websites to integrate search without any need to install/maintain additional servers.
You’ll need an Algolia Account for this plugin to work.
Supported Moodle Versions
Moodle 3.1 and later are currently supported.
About Algolia
Algolia is a hosted Search as a Service provider making it easy for websites to integrate search without any need to install/maintain additional servers.
It currently offers a free plan with 10k records and 100k API calls per month. More info about its plans  here
Algolia Credentials
This plugin relies on the Algolia service which requires you to create an account  here  to obtain the  APPLICATION ID and  API KEY  in your  dashboard
Create an Algolia Account.
Create a  new Application  and obtain the  APPLICATION ID  and  API KEY .
Installing the Plugin
Install the plugin by uploading the downloaded zip package from  Moodle Plugins
You’ll be asked for Algolia credentials ( Application ID  and  Admin API KEY ). Save these settings
Go to  Plugins  >  Search  >  Manage Global Search  in your Moodle site. Change search engine used to  Algolia from the dropdown
Enable Global Search as it is disabled by default
Credits