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/usr/share/idzebra-2.0/tab/icu.idx is in idzebra-2.0-common 2.0.59-1ubuntu1.

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The actual contents of the file can be viewed below.

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# 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