Indexing the post ID

Are post ID’s searchable in Relevanssi?

No. Relevanssi does understand the WP_Query p parameter to restrict the search by post ID.

However, if you want to search by post ID, it’s very simple to make that happen using the relevanssi_content_to_index filter hook:

add_filter( 'relevanssi_content_to_index', 'rlv_index_post_id', 10, 2 );
function rlv_index_post_id( $content, $post ) {
    $content .= ' ' . $post->ID;
    return $content;
}

Add that to theme functions.php, reindex and searching for post ID’s works.

Originally asked here.