lib/Elastica/Suggest/Phrase.php
public function setHighlight(string $preTag, string $postTag): Phrase
    {
        return $this->setParam('highlight', [
            'pre_tag' => $preTag,
            'post_tag' => $postTag,
        ]);
    }
public function setHighlight(string $preTag, string $postTag): Phrase
    {
        return $this->setParam('highlight', [
            'pre_tag' => $preTag,
            'post_tag' => $postTag,
        ]);
    }
public function setHighlight ( string $ preTag , string $ postTag ) : Phrase { return $ this -> setParam ( 'highlight' , [ 'pre_tag' => $ preTag , 'post_tag' => $ postTag , ] ) ; }
Set suggestion highlighting.

@param string $preTag
@param string $postTag

@return $this
Set suggestion highlighting .