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The Facet module allows site builders to easily create and manage faceted search interfaces.
The Facet module allows site builders to easily create and manage faceted search interfaces. In addition to the UI components that come out of the box, themers and module developers can build their own widgets that can optionally be contributed back to Drupal.org. Facets work with Drupal Core Search and Search API, meaning that code and configuration can be reused as-is with the most popular search solutions available to Drupal.
Instead of showing a "404 Page not found", this module performs a search on the keywords in the URL and provide a better user experience.
Search404 module helps retain visitors coming in from old URLs linked from other sites or search indices by providing a search result on the keywords extracted from the missing page URL. This improves the site's SEO by making sure old defunct URLs or typo errors do not detract visitors from getting to the content on the site relevant to their search.
Search API Solr supports Drupal 8 and 9 and mostly any Solr version since 4.5.1. There's no further need to stay with 8.x-1.x.
The 4.x releases come with a complete upgrade path including Search API Solr Multilingual. But you should be aware of some facts and the right order of doing things.
The Search API opensolr security is a submodule that integrates the opensolr security API into Drupal. The goal is to allow users to add/remove Basic Auth to their indexes and/or to manage IP restrictions for them without having to go to their opensolr account.