Several missing token filter types #4251
Description
An issue was opened on the JS client repo noting the missing cjk_bigram token filter type. I went through the docs and identified several missing token filter types:
apostrophearabic_normalizationcjk_bigramcjk_widthclassicdecimal_digitflatten_graphgerman_normalizationhindi_normalizationindic_normalizationkeyword_repeatmin_hashpersian_normalizationphoneticscandinavian_foldingscandinavian_normalizationserbian_normalizationsorani_normalization
Assigning to myself, as I'd like to at least solve for the one reported on my repo, but it's a good opportunity to scan through the spec and knock out several fixes at once.