I opened a HI ticket about this and it was communicated that the global
text search does not respect more non-alphanumeric characters.

So it turns out that the keyword search doesn't respect _ characters.
Meaning if you search for "this_custom_word" and you expect to find
results, if one of those words is on the Stop list tables
(ts_index_stop, and ts_stop). It may not show up.

Just something HI made me aware of. I askd if they have other
delimiters, but they said its just _ and space.

If I get more information I'll update this.