This file is indexed.

/usr/share/postgres-xc/extension/pg_buffercache.control is in postgres-xc-contrib 1.1-2ubuntu2.

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

The actual contents of the file can be viewed below.

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# pg_buffercache extension
comment = 'examine the shared buffer cache'
default_version = '1.0'
module_pathname = '$libdir/pg_buffercache'
relocatable = true