I actually realized that I have a problem when using wordpress searcher after deep integration because it doesn’t work if you are browsing bbpress.
I have wp searcher in the wp header and I load this header into bbpress. Whenever you try to search while being in bbpress yo get a 404 error because the link of the search is this one;
/wordpress/bbpress/index.php?s=lorem
There is another search plugin for bbPress that appends a WordPress search to the bbPress search.
https://bbpress.org/plugins/topic/wp-search/
I will eventually add wordpress searching to super-search, I just ran out of time/interest.
Using deep integration, if you load the WordPress search box into the header of bbPress, you can still search WordPress alone if you use something like
<form id="searchform" method="get" action="<?php echo get_settings('home'); ?>">
This way the search form is using the WordPress root directory as it’s destination rather than trying to redirect to a bbPress file.
As far as a unified search solution, the problem there really then becomes which engine do you use to display the results, WP or BBP? Either way it requires a plug-in on that relative side of the equation. It’s certainly possible, but you’re only making 50% of your audience happy at that point, because the other 50% will want it the other way.
Thanks for the code John 
Half the results but it actually could solve the 404 problem.
However, adding a get_settings(‘home’) to the search form makes this search;
/wordpress/wordpress/bbpress/?s=
I had in mind that perhaps anybody developed a wordpress plugin that could search both, wp and bb and then display the results, first all the wp entries and next all the bb entries.
Or maybe a conditional in the wp template where I placed wp searcher; first the wp searcher with anything similar to John’s get_settings(‘home’) and then a conditional; if this is bbpress then use bbpress searcher and append the results. I already have a function to create bb conditionals in wp;
function is_bbpress() {
global $bb;
return $bb ? true : false;
}
There is another search plugin for bbPress that appends a WordPress search to the bbPress search.
I wanted all the contrary a wp plugin that appends bb results at the end of the search.
BTW, after finding the searcher issue I realized that 404 templates need integration too.
Well I implemented my silly workaround with the conditional in the header and it works;
if this is_bbress -> bbpress search form
else -> wp search form
you get results only for the forum inf you are browsing bbpress and only for wordpress if you are in wp.
