Notice you have exactly two documents in the index. Relevanssi won’t index files from a plugin, just your posts and pages.
expand shortcode in post
If checked, Relevanssi will expand shortcodes in post content before indexing. Otherwise shortcodes will be stripped. If you use shortcodes to include dynamic content, Relevanssi will not keep the index updated, the index will reflect the status of the shortcode content at the moment of indexing
I thought if this was checked it would index
State of the Index
Documents in the index: 3
Terms in the index: 12889
Highest post ID indexed: 119
it looks like it is here
I also tried Yolink search for wordpress. this works but does not match all links that should match.