This file is indexed.

/etc/news/buffindexed.conf is in inn2 2.6.0-2.

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

The actual contents of the file can be viewed below.

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##  $Id: buffindexed.conf.in 7651 2007-08-20 10:28:34Z iulius $
##
##  Configuration for the buffindexed overview method.
##
##  It specifies the buffers that the buffindexed overview method
##  should use.  It is required if the server uses buffindexed (as
##  configured by the ovmethod: parameter in inn.conf).
##  See the buffindexed.conf man page for more information.
##
##  The order of lines in this file is not important.

##  Format:
##    index(0-65535) : path to buffer file : 
##      length of buffer in kilobytes in decimal (1KB = 1024 bytes)

0:/var/spool/news/overview/OV1:1536000
1:/var/spool/news/overview/OV2:1536000