missing helper program pylzma not available

[Jerry Quinn]

After indexing, I see the following at the end of the log:

:3:index/fsindexer.cpp:247::FsIndexer::index missing helper program(s):
python3:pylzma (application/x-7z-compressed)

However, pylzma does not seem to be available in Ubuntu. I don't know if this counts as a bug against recoll or not, but it would be good to include info on how to address this missing helper program.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: recoll 1.26.3-1build1
Uname: Linux 5.8.18-050818-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jan 3 22:42:29 2021
InstallationDate: Installed on 2020-05-29 (219 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: recoll
UpgradeStatus: Upgraded to focal on 2020-11-04 (60 days ago)