https://solr.apache.org/docs/7_2_0/solr-ltr/org/apache/solr/ltr/model/ModelException.html
ModelException (Solr 7.2.0 API)
solrapi
https://solr.apache.org/docs/9_2_1/modules/ltr/org/apache/solr/ltr/model/ModelException.html
ModelException (Solr 9.2.1 ltr API)
solrltrapi