(Não há informação de versão disponível, talvez apenas no SVN)
SolrDisMaxQuery::setBoostFunction — Sets a Boost Function (bf parameter).
Sets Boost Function (bf parameter).
Functions (with optional boosts) that will be included in the user's query to influence the score. Any function supported natively by Solr can be used, along with a boost value. e.g.:
recip(rord(myfield),1,2,3)^1.5
function
Exemplo #1 SolrDisMaxQuery::setBoostFunction() example
<?php
$dismaxQuery = new SolrDisMaxQuery('lucene');
$boostRecentDocsFunction = "recip(ms(NOW,mydatefield),3.16e-11,1,1)";
$dismaxQuery->setBoostFunction($boostRecentDocsFunction);
echo $dismaxQuery.PHP_EOL;
?>
O exemplo acima irá imprimir algo similar à:
q=lucene&defType=edismax&bf=recip(ms(NOW,mydatefield),3.16e-11,1,1)