Relevanssi returns zero results in custom query

gistfile1.php

<?php 

	$wp_query = new WP_Query( array(

		'post_type' => 'any',
		'posts_per_page' => '5',

		// If we just set the vars above, the query returns posts as expected. But setting
		// a search term causes the query to return 0 results (if Relevanssi is activated)
		's' => 'test', // or get_search_query(), or a variable containing search term

	) );

	// Testing confirms that posts_per_page and s are being set
	echo $wp_query->query_vars['posts_per_page']; // works
	echo $wp_query->query_vars['s']; // works
	if (is_search()) echo 'This is a search.'; // works

	// Wrapping query in relevanssi_do_query() kills results
	// relevanssi_do_query($wp_query);

	// Displays the posts
	get_template_part( 'loop', 'blog' );