This file is indexed.

/usr/share/postgresql/9.5/extension/prefix.control is in postgresql-9.5-prefix 1.2.4-1.

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

The actual contents of the file can be viewed below.

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# prefix extension
comment = 'Prefix Range module for PostgreSQL'
default_version = '1.2.0'
module_pathname = '$libdir/prefix'
relocatable = true