(PECL solr >= 0.9.2)
SolrQuery::addMltQueryField — Maps to mlt.qf
public SolrQuery::addMltQueryField(string $field, float $boost): SolrQuery
Maps to mlt.qf. It is used to specify query fields and their boosts
fieldThe name of the field
boostIts boost value
Returns the current SolrQuery object, if the return value is used.
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https://www.php.net/manual/en/solrquery.addmltqueryfield.php