See SOLR-13132
Deployment
Care must be taken in deployment to load classes from the solrplugins jar file before
corresponding classes from the stock Solr jar files. This is best accomplished using
Jetty's extraClasspath method
to affect the load order of jar files within Jetty, adding the following child element:
<Set name="extraClasspath">${path_to}/facet-cache-solr-7.5.0.jar</Set>to the Solr Jetty WebAppContext configuration. The relevant config file in the
standard Solr distribution is server/contexts/solr-jetty-context.xml. The path is
rooted at /opt/solr/ in the stock Solr docker image.
Facet cache configuration
To configure the facetCache, add the following cache config to your solrconfig.xml:
<cache name="termFacetCache"
class="solr.search.LRUCache"
size="200"
initialSize="200"
autowarmCount="200"
regenerator="solr.request.TermFacetCacheRegenerator" />