Document what LSI is actually doing #5033
On the Variables page (https://jekyllrb.com/docs/variables/), the related_posts feature has this to say about it:
"If the page being processed is a Post, this contains a list of up to ten related Posts. By default, these are the ten most recent posts. For high quality but slow to compute results, run the jekyll command with the --lsi (latent semantic indexing) option. Also note GitHub Pages does not support the lsi option when generating sites."
So, my read of this is that --lsi does something fancy ("semantic indexing" sounds cool!), but the docs don't seem to actually say what this means. Is it parsing my content and attempting to find other posts that are similar to it? Is there any way to configure this? For example, what if I want it to just find similar content within the same category?
I guess my request is - it seems like this is a powerfully cool feature, but there seems to be literally no information about it. (If there is, maybe it could be linked to from here?)
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