[DOCS] Add supported token filters
Update normalizers.asciidoc with the list of supported token filters
Closes
@@ -8,7 +8,12 @@ token. As a consequence, they do not have a tokenizer and only accept a subset
of the available char filters and token filters. Only the filters that work on
a per-character basis are allowed. For instance a lowercasing filter would be
allowed, but not a stemming filter, which needs to look at the keyword as a
-whole.
+whole. The current list of filters that can be used in a normalizer is
+following: `arabic_normalization`, `asciifolding`, `bengali_normalization`,
+`cjk_width`, `decimal_digit`, `elision`, `german_normalization`,
+`hindi_normalization`, `indic_normalization`, `lowercase`,
+`persian_normalization`, `scandinavian_folding`, `serbian_normalization`,
+`sorani_normalization`, `uppercase`.
[float]
=== Custom normalizers
