The special characters are
,
.
+
-
These characters had to become searchable because of other needs.
According to Endeca guides, because they are searchable, they can be used in phrases as well ie "apple + orange".
The problem is that this doesn't seem to work, the phrasing isn't happening and the terms are treated as normal search(while the phrase has been manually tested, using quotes, in reference application to confirm the existance of results).
Did some tries with 11.2 version just to check if it is an older bug but it didn't work either.
Thanks