Search tools
A static website with a dynamic search function? Yes, Hugo provides an alternative to embeddable scripts from Google or other search engines for static websites. Hugo allows you to provide your visitors with a custom search function by indexing your content files directly.
Open-source​
Pagefind : A fully static search library that aims to perform well on large sites, while using as little of your users' bandwidth as possible.
GitHub Gist for Hugo Workflow : This gist contains a simple workflow to create a search index for your static website. It uses a simple Grunt script to index all your content files and lunr.js to serve the search results.
hugo-lunr : A simple way to add site search to your static Hugo site using lunr.js. Hugo-lunr will create an index file of any HTML and Markdown documents in your Hugo project.
hugo-lunr-zh : A bit like Hugo-lunr, but Hugo-lunr-zh can help you separate the Chinese keywords.
GitHub Gist for Fuse.js integration : This gist demonstrates how to leverage Hugo's existing build time processing to generate a searchable JSON index used by Fuse.js on the client-side. Although this gist uses Fuse.js for fuzzy matching, any client-side search tool capable of reading JSON indexes will work. Does not require npm, grunt, or other build-time tools except Hugo!
hugo-search-index : A library containing Gulp tasks and a prebuilt browser script that implements search. Gulp generates a search index from project Markdown files.
hugofastsearch : A usability and speed update to "GitHub Gist for Fuse.js integration" — global, keyboard-optimized search.
JS & Fuse.js tutorial : A simple client-side search solution, using FuseJS (does not require jQuery).
Hugo Lyra : Hugo-Lyra is a JavaScript module to integrate Lyra into a Hugo website. It contains the server-side part to generate the index and the client-side library (optional) to bootstrap the search engine easily.
Commercial​
Algolia : Algolia's Search API makes it easy to deliver a great search experience in your apps and websites. Algolia Search provides hosted full-text, numerical, faceted, and geolocalized search.
Bonsai : Bonsai is a fully-managed hosted Elasticsearch service that is fast, reliable, and simple to set up. Easily ingest your docs from Hugo into Elasticsearch following this guide from the docs.
ExpertRec : ExpertRec is a hosted search-as-a-service solution that is fast and scalable. Set-up and integration is extremely easy and takes only a few minutes. The search settings can be modified without coding using a dashboard.