Setting up Faceted Apache Solr search in Drupal 8

Note: Extra special thanks to Doug Vann for providing motivation to finally post this blog post!

Early in 2016, when the Search API and Solr-related modules for Drupal 8 were in early alpha status, I wrote the blog post Set up a faceted Apache Solr search page on Drupal 8 with Search API Solr and Facets.

Set up faceted Apache Solr search on Drupal 8 (2016 - deprecated)

Note: A lot has changed in Drupal 8 and the Search API module ecosystem since this post was written in May 2016... I wrote a new blog post for Faceted Solr Search in Drupal 8, so please read that if you're just getting started. I'm leaving this up as a historical reference, as the general process and architecture are the same, but many details are different.

In Drupal 8, Search API Solr is the consolidated successor to both the Apache Solr Search and Search API Solr modules in Drupal 7. I thought I'd document the process of setting up the module on a Drupal 8 site, connecting to an Apache Solr search server, and configuring a search index and search results page with search facets, since the process has changed slightly from Drupal 7.

Set up a hierarchical taxonomy term Facet using Facet API with Search API Solr

I wanted to document this here just because it took me a little while to get all the bits working just right so I could have a hierarchical taxonomy display inside a Facet API search facet, rather than a flat display of only the taxonomy terms directly related to the nodes in the current search.

Basically, I had a search facet on a search page that allowed users to filter search results by a taxonomy term, and I wanted it to show the taxonomy's hierarchy:

Flat taxonomy to hierarchical taxonomy display using Search API Solr and Facet API in Drupal 7

To do this, you need to do two main things:

  1. Make sure your taxonomy field is being indexed with taxonomy hierarchy data intact.
  2. Set up the Facet API facet for this taxonomy term so it will display the full hierarchy.

Let's first start by making sure the taxonomy information is being indexed (refer to the image below):

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