Solr Core B Solr Core A Solr Index A Site A R/W Solr Backend Solr Index B Site B R/W Solr Backend Site A additionally offers a search for content of Site B Solr Core B Solr Core A Solr Index A Site A R/W Solr Backend Solr Index B Site B R/W Solr Backend Site A additionally offers a multisite search for content of Site A and Site B Solr Core C Solr Index A Solr Index B R/W Solr Backends filter on "index ID", Site A R/W Solr Backend Site B R/W Solr Backend Site A additionally offers a search for content of Site B or Site A additionally offers a multisite search for content of Site A and Site B Single Solr Core Solr Index A Solr Index B Recommended Setups Poor Man Setup Advanced features like autocomplete, suggestions, spellchecking for regular (non-multisite) searches on both sites might offer wrong results. Read only Solr Backend R/W Solr Backend R/W Solr Backend