Relevanssi Langwitch support

rlv_array_reducer.php

<?php

// Add these to theme functions.php and go save the pages.

add_filter( 'relevanssi_content_to_index', 'rlv_langwitch_elements', 10, 2 );
function rlv_langwitch_elements( $content, $post ) {
    $elements        = get_option( '_alt_langwitch_elements_opts_page_' . $post->ID );
	$element_content = '';
	foreach ( $elements as $item ) {
		$value = rlv_process_array( $item );
		if ( ! empty( $value ) ) {
			$element_content .= ' ' . $value;
		}
	}
	$content .= $element_content;
	return $content;
}

function rlv_process_array( $array ) {
	foreach ( $array as $key => $value ) {
		if ( 'es_ES' === $key ) {
			return $value;
		}
		if ( is_array( $value ) ) {
			$value = rlv_process_array( $value );
			if ( $value ) {
				return $value;
			}
		}
	}
	return $value;
}