/usr/share/idzebra-2.0/tab/icu.idx is in idzebra-2.0-common 2.0.59-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | # ICU indexing for words and phrases.. Otherwise similar
# to default.idx .
# Traditional word index
# Used if completenss is 'incomplete field' (@attr 6=1) and
# structure is word/phrase/word-list/free-form-text/document-text
index w
completeness 0
position 1
alwaysmatches 1
firstinfield 1
icuchain words-icu.xml
# debug 1
# Phrase index
# Used if completeness is 'complete {sub}field' (@attr 6=2, @attr 6=1)
# and structure is word/phrase/word-list/free-form-text/document-text
index p
completeness 1
icuchain phrases-icu.xml
# debug 1
# Sort register
sort s
completeness 1
charmap string.chr
# Staticrank (uncomment to enable)
#staticrank r
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