Add minimum one fake field config, otherwise Solr does not index

extensions/ter_fe2/Configuration/TypoScript/Default/Plugins/Solr.typoscript

@@ -13,6 +13,11 @@ plugin {
           table = tx_terfe2_domain_model_extension
           additionalWhereClause = last_version > 0
           indexer = T3o\TerFe2\Solr\IndexQueue\TerIndexer
+
+          # Add minimum one fake field configuration, otherwise Solr does not index
+          fields {
+            title = title
+          }
         }
       }
     }