I just added this package and am testing it out for the first time and came across this issue:

I want to exclude some pages from the search results, so I added the property 'umbracoSearchHide'. However I have to recreate the index on the developer tab in order for this be applied as true. I can publish a page and have the page hidden, and it will stay hidden. If I then toggle this to unhide it, publish, it will show in results. Then if I toggle it to true (hide) again, publish, it still shows in the results. I then have to delete and recreate the index (just re-indexing doesn't work). in order for the page to be hidden from the search results.

I took this a step further and added then removed some text from a page. After removing the text and publishing the page, it still shows up in the search results.