This file is indexed.

/usr/share/idzebra-2.0/tab/default.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.

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# Zebra indexes as referred to from the *.abs-files.
#

# 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
charmap string.chr

# 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
charmap string.chr

# URX (URL) index
# Used if structure=urx (@attr 4=104)
index u
completeness 0
charmap urx.chr

# Numeric index
# Used if structure=numeric (@attr 4=109)
index n
completeness 0
charmap numeric.chr

# Null map index (no mapping at all)
# Used if structure=key (@attr 4=3)
index 0
completeness 0
position 1
charmap @

# Year
# Used if structure=year (@attr 4=4)
index y
completeness 0
charmap @

# Date
# Used if structure=date (@attr 4=5)
index d
completeness 0
charmap @

# Sort register
sort s
completeness 1
charmap string.chr

# Staticrank (uncomment to enable)
#staticrank r