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//change amount of posts on the search page - set here to 100
function wpfme_search_results_per_page( $query ) {
	global $wp_the_query;
	if ( ( ! is_admin() ) && ( $query === $wp_the_query ) && ( $query->is_search() ) ) {
	$query->set( 'wpfme_search_results_per_page', 100 );
	}
	return $query;
}
add_action( 'pre_get_posts',  'wpfme_search_results_per_page'  );