/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/ is in liblucy-perl 0.3.3-7+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Architecture.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Architecture.pod
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/BlobType.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/BlobType.pod
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/FieldType.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/FieldType.pod
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Float32Type.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Float64Type.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/FullTextType.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/FullTextType.pod
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Int32Type.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Int64Type.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Schema.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/Schema.pod
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/StringType.pm
/usr/lib/x86_64-linux-gnu/perl5/5.24/Lucy/Plan/StringType.pod