Find the `supported.languages` property (around line 202) and ensure your language code is included:

```properties
supported.languages=ar,bg,bn,ca,ckb_IQ,cs,da,de,el,en_IE,en,es,et,eu,fa,fi,fr,gl,gu,he,hi,hr,hu,hy,id,it,ja,ko,lt,lv,mk,ml,nl,no,pa,pl,pt_BR,pt,ro,ru,si,sq,sv,ta,te,th,tl,tr,uk,ur,vi,zh_CN,zh_TW,zh
```

**Optional configurations:**

If you create online help documentation:
```properties

    /** Supported languages. */
    protected static final String[] SUPPORTED_LANGUAGES = { "ar", "bg", "bn", "ca", "cs", "da", "de", "el", "en", "es", "et", "fa", "fi",
            "fr", "gu", "he", "hi", "hr", "hu", "id", "it", "ja", "ko", "lt", "lv", "mk", "ml", "nl", "no", "pa", "pl", "pt", "ro", "ru",
            "si", "sq", "sv", "ta", "te", "th", "tl", "tr", "uk", "ur", "vi", "zh-cn", "zh-tw" };

    /**

da=da\n\
de=de\n\
el=el\n\
en=en\n\
en-ie=en-ie\n\
en_IE=en-ie\n\
es=es\n\
et=et\n\
eu=eu\n\
fa=fa\n\
fi=fi\n\
fr=fr\n\
gl=gl\n\
gu=gu\n\
he=he\n\
hi=hi\n\
hr=hr\n\
hu=hu\n\
hy=hy\n\
id=id\n\
it=it\n\
ja=ja\n\
ko=ko\n\
lt=lt\n\
lv=lv\n\
mk=mk\n\
ml=ml\n\
nl=nl\n\
no=no\n\
pa=pa\n\
pl=pl\n\
pt=pt\n\
pt-br=pt-br\n\
pt_BR=pt-br\n\

        "type":       "stop",
        "stopwords":  "_hungarian_"
      },
      "hungarian_keywords": {
        "type":       "keyword_marker",
        "keywords_path": "${fess.dictionary.path}hu/protwords.txt"
      },
      "hungarian_stemmer": {
        "type":       "stemmer",
        "language":   "hungarian"
      },
      "indonesian_stop": {
        "type":       "stop",

     * et=et<br>
     * eu=eu<br>
     * fa=fa<br>
     * fi=fi<br>
     * fr=fr<br>
     * gl=gl<br>
     * gu=gu<br>
     * he=he<br>
     * hi=hi<br>
     * hr=hr<br>
     * hu=hu<br>
     * hy=hy<br>
     * id=id<br>
     * it=it<br>
     * ja=ja<br>
     * ko=ko<br>
     * lt=lt<br>
     * lv=lv<br>
     * mk=mk<br>
     * ml=ml<br>
     * nl=nl<br>

Sukhwan Kim, Sunitha Kambhampati, Taehoon Lee, tamimaddari82, Tang, Wenyi, Ted
Chang, u2takey, Utkarsh Upadhyay, Vadim Markovtsev, voegtlel, Wai Hon Law,
wangsiyu, Wenhao Hu, wenhao.hu, William D. Irons, Yan Facai (颜发才), Yanbo Liang,
Yihong Wang, Yilei (Dolee) Yang, Yong Tang, Yuan (Terry) Tang

# Release 1.8.0

## Major Features And Improvements

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321D          ; disallowed_STD3_mapped ; 0028 C624 C804 0029 #4.0 PARENTHESIZED KOREAN CHARACTER OJEON
321E          ; disallowed_STD3_mapped ; 0028 C624 D6C4 0029 #4.0 PARENTHESIZED KOREAN CHARACTER O HU
321F          ; disallowed                             # NA   <reserved-321F>
3220          ; disallowed_STD3_mapped ; 0028 4E00 0029 #1.1  PARENTHESIZED IDEOGRAPH ONE

n wn(e)?a?n+"m\xe1nu\xf0ir":n+(s?"m\xe1nu\xf0i":"m\xe1nu\xf0um"):a?n+"m\xe1nu\xf0ur":n+(s?"m\xe1nu\xf0":"m\xe1nu\xf0i");case"y":return a||s?"\xe1r":"\xe1ri";case"yy":return wn(e)?n+(a||s?"\xe1r":"\xe1rum"):n+(a||s?"\xe1r":"\xe1ri")}}M.defineLocale("hu",{months:"janu\xe1r_febru\xe1r_m\xe1rcius_\xe1prilis_m\xe1jus_j\xfanius_j\xfalius_augusztus_szeptember_okt\xf3ber_november_december".split("_"),monthsShort:"jan._feb._m\xe1rc._\xe1pr._m\xe1j._j\xfan._j\xfal._aug._szept._okt._nov._dec.".split("_"),m...