Quick update how the query looks like
string(714) "SELECT DISTINCT(relevanssi.doc), relevanssi.*, relevanssi.title * 5 +
relevanssi.content * 5 + relevanssi.comment * 0.75 +
relevanssi.tag * 1 + relevanssi.link * 0.75 +
relevanssi.author + relevanssi.category * 1 + relevanssi.excerpt +
relevanssi.taxonomy + relevanssi.customfield + relevanssi.mysqlcolumn AS tf
FROM wp_relevanssi AS relevanssi WHERE relevanssi.term = '45' AND ((relevanssi.doc IN (SELECT DISTINCT(posts.ID) FROM wp_posts AS posts
WHERE posts.post_type NOT IN ('revision', 'nav_menu_item', 'custom_css', 'customize_changeset', 'oembed_cache', 'user_request', 'acf-field-group', 'acf-field', 'smart-services', 'archive', 'faq'))) OR (doc = -1)) ORDER BY tf DESC LIMIT 500"