This file is indexed.

/var/lib/dictionaries-common/ispell/iamerican is in iamerican 3.4.00-6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Language:         american (American English)
Hash-Name:        american
Emacsen-Name:     american
Casechars:        [A-Za-z]
Not-Casechars:    [^A-Za-z]
Otherchars:       [']
Many-Otherchars:
Additionalchars:
Ispell-Args:      -B -d american
Extended-Character-Mode:
Coding-System:    iso-8859-1
Pspell-Ispell:    en-american iso8859-1
auto-compat:      american
Locale:           en_US