https://www.php.net/manual/it/solrquery.getmltmintermfrequency.php
PHP: SolrQuery::getMltMinTermFrequency - Manual
Returns the frequency below which terms will be ignored in the source document
phpmanual
https://www.php.net/manual/ja/solrquery.getmltmintermfrequency.php
PHP: SolrQuery::getMltMinTermFrequency - Manual
Returns the frequency below which terms will be ignored in the source document
phpmanual