jekyll-lunr-js-custom-search is a gem for creating custom searches of collections or posts. It is not a full site search. It can be used for the creation of a single query or a more robust custom search interface.
Sites which are using this gem are:
| North Carolina Architects and Builders | http://ncarchitects.lib.ncsu.edu |
Sites using JavaScript plugin only
| Local IIIF Annotation Server | https://dnoneill.github.io/annotate/ |