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/etc/solr/conf/lang/userdict_ja.txt is in solr-common 3.6.2+dfsg-10+deb9u2.

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The actual contents of the file can be viewed below.

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#
# This is a sample user dictionary for Kuromoji (JapaneseTokenizer)
#
# Add entries to this file in order to override the statistical model in terms
# of segmentation, readings and part-of-speech tags.  Notice that entries do
# not have weights since they are always used when found.  This is by-design
# in order to maximize ease-of-use.
#
# Entries are defined using the following CSV format:
#  <text>,<token 1> ... <token n>,<reading 1> ... <reading n>,<part-of-speech tag>
#
# Notice that a single half-width space separates tokens and readings, and
# that the number tokens and readings must match exactly.
#
# Also notice that multiple entries with the same <text> is undefined.
#
# Whitespace only lines are ignored.  Comments are not allowed on entry lines.
#

# Custom segmentation for kanji compounds
日本経済新聞,日本 経済 新聞,ニホン ケイザイ シンブン,カスタム名詞
関西国際空港,関西 国際 空港,カンサイ コクサイ クウコウ,カスタム名詞

# Custom segmentation for compound katakana
トートバッグ,トート バッグ,トート バッグ,かずカナ名詞
ショルダーバッグ,ショルダー バッグ,ショルダー バッグ,かずカナ名詞

# Custom reading for former sumo wrestler
朝青龍,朝青龍,アサショウリュウ,カスタム人名