apply_filters( 'relevanssi_disable_stopwords', bool $disable )
Disables stopwords completely.
Parameters
$disable
(boolean) Return true to completely disable stopwords. Default false.
More information
If you have this filter hook return true, all stopword functionality is disabled in the Relevanssi tokenizer. The list of stopwords Relevanssi comes up with is emptied out.
add_filter( 'relevanssi_disable_stopwords', '__return_true' );