This file is indexed.

/usr/include/KF5/MessageComposer/AliasesExpandJob is in libkf5messagecomposer-dev 4:17.12.3-0ubuntu3.

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

The actual contents of the file can be viewed below.

1
#include "messagecomposer/aliasesexpandjob.h"