hello stephen
murad@murad:/var/log$ ls -l /var/log
total 832024
-rw-r--r--  1 root          root                  897 Apr  6 01:14 alternatives.log
-rw-r--r--  1 root          root                12193 Mar 28 13:38 alternatives.log.1
-rw-r--r--  1 root          root                  380 Feb 28 06:32 alternatives.log.2.gz
-rw-r--r--  1 root          root                  194 Jan 15 06:04 alternatives.log.3.gz
-rw-r--r--  1 root          root                 1702 Dec 16 20:00 alternatives.log.4.gz
-rw-r--r--  1 root          root                  154 Nov 19 06:26 alternatives.log.5.gz
-rw-r--r--  1 root          root                 6610 Oct 25 12:14 alternatives.log.6.gz
-rw-r-----  1 root          adm                     0 Mar  4 00:00 apport.log
-rw-r-----  1 root          adm                   624 Mar  3 21:52 apport.log.1
-rw-r-----  1 root          adm                   346 Feb 25 13:23 apport.log.2.gz
-rw-r-----  1 root          adm                   224 Dec  7 09:08 apport.log.3.gz
-rw-r-----  1 root          adm                   334 Nov  5 06:59 apport.log.4.gz
-rw-r-----  1 root          adm                   662 Oct 25 12:34 apport.log.5.gz
-rw-r-----  1 root          adm                   250 Oct 19 21:49 apport.log.6.gz
drwxr-xr-x  2 root          root                 4096 Apr  6 09:50 apt
-rw-r-----  1 syslog        adm              17773828 Apr  6 20:25 auth.log
-rw-r-----  1 syslog        adm              44835056 Apr  4 00:00 auth.log.1
-rw-r-----  1 syslog        adm                361622 Mar 29 00:00 auth.log.2.gz
-rw-r-----  1 syslog        adm               3185099 Mar 28 00:00 auth.log.3.gz
-rw-r-----  1 syslog        adm                488812 Mar 22 00:00 auth.log.4.gz
-rw-r--r--  1 root          root                56751 Jul 25  2018 bootstrap.log
-rw-rw----  1 root          utmp             47589888 Apr  6 20:25 btmp
-rw-rw----  1 root          utmp            208658304 Apr  1 00:00 btmp.1
-rw-r--r--  1 syslog        adm                801843 Feb 19 07:33 cloud-init.log
-rw-r--r--  1 root          root                38427 Feb 19 07:33 cloud-init-output.log
drwxr-xr-x  2 root          root                 4096 Apr  6 00:00 cups
drwxr-xr-x  3 root          root                 4096 Oct 19 19:22 dist-upgrade
-rw-r--r--  1 root          adm                 82693 Feb 19 07:33 dmesg
-rw-r--r--  1 root          adm                 82733 Dec 14 13:03 dmesg.0
-rw-r--r--  1 root          adm                 21049 Oct 25 12:18 dmesg.1.gz
-rw-r--r--  1 root          adm                 21012 Oct 25 11:55 dmesg.2.gz
-rw-r--r--  1 root          adm                 20938 Oct 22 11:36 dmesg.3.gz
-rw-r--r--  1 root          adm                 20761 Oct 20 10:47 dmesg.4.gz
-rw-r--r--  1 root          root                 9277 Apr  6 09:53 dpkg.log
-rw-r--r--  1 root          root                87720 Mar 30 06:54 dpkg.log.1
-rw-r--r--  1 root          root                16417 Feb 28 06:32 dpkg.log.2.gz
-rw-r--r--  1 root          root                 4470 Jan 30 06:54 dpkg.log.3.gz
-rw-r--r--  1 root          root                 9703 Dec 16 20:00 dpkg.log.4.gz
-rw-r--r--  1 root          root                 4991 Nov 30 17:56 dpkg.log.5.gz
-rw-r--r--  1 root          root               146715 Oct 30 06:14 dpkg.log.6.gz
drwxrwsrwx  2 elasticsearch elasticsearch        4096 Apr  6 19:31 elasticsearch
-rw-r--r--  1 root          root              2049792 Apr  4 08:43 faillog
drwx------  2 root          root                 4096 Apr  3 20:28 filebeat
-rw-r--r--  1 root          root                 3893 Mar 28 13:36 fontconfig.log
drwxr-xr-x  2 root          root                 4096 Sep  8  2020 gdm3
drwxr-xr-x  2 root          root                 4096 Oct 12 13:57 installer
drwxr-sr-x+ 3 root          systemd-journal      4096 Oct 12 14:05 journal
-rw-r-----  1 syslog        adm                113997 Apr  6 20:20 kern.log
-rw-r-----  1 syslog        adm                134848 Apr  3 23:35 kern.log.1
-rw-r-----  1 syslog        adm                  9246 Mar 28 23:21 kern.log.2.gz
-rw-r-----  1 syslog        adm                 19116 Mar 26 07:18 kern.log.3.gz
-rw-r-----  1 syslog        adm                  2029 Mar 21 23:32 kern.log.4.gz
drwxrwsrwx  2 kibana        kibana               4096 Mar 28 22:14 kibana
drwxr-xr-x  2 landscape     landscape            4096 Oct 12 14:06 landscape
-rw-rw-r--  1 root          utmp             18704352 Apr  6 17:56 lastlog
drwx------  2 root          root                 4096 Apr  6 14:58 letsencrypt
drwxr-xr-x  5 root          root                 4096 Feb 25 13:12 libvirt
drwxr-xr-x  2 root          root                 4096 Apr  5 00:00 lightdm
drwxr-x---  2 www-data      www-data             4096 Apr  4 00:00 lighttpd
drwxr-xr-x  2 logstash      root                 4096 Apr  2 17:14 logstash
drwx------  2 root          root                 4096 Apr  4 21:28 metricbeat
-rw-r-----  1 root          adm               1553828 Apr  6 20:24 monit.log
-rw-r-----  1 root          adm               1600645 Mar 31 00:00 monit.log.1
-rw-r-----  1 root          adm                 46454 Mar 24 00:00 monit.log.2.gz
-rw-r-----  1 root          adm                 63318 Mar 19 00:00 monit.log.3.gz
-rw-r-----  1 root          adm                 64098 Mar 12 00:01 monit.log.4.gz
drwxr-xr-x  2 root          adm                  4096 Apr  3 00:00 nginx
drwxr-xr-x  2 pihole        pihole               4096 Oct 24 10:29 pihole
-rw-r--r--  1 root          pihole              32635 Mar 24 20:29 pihole_debug.log
-rw-r--r--  1 pihole        pihole                  0 Apr  5 00:00 pihole-FTL.log
-rw-r--r--  1 pihole        pihole             230325 Apr  5 00:00 pihole-FTL.log.1
-rw-r--r--  1 pihole        pihole              86864 Apr  4 00:00 pihole-FTL.log.2.gz
-rw-r--r--  1 pihole        pihole              63883 Apr  3 00:00 pihole-FTL.log.3.gz
-rw-r--r--  1 pihole        pihole                  0 Apr  5 00:00 pihole.log
-rw-r--r--  1 pihole        pihole            2875685 Apr  5 00:00 pihole.log.1
-rw-r--r--  1 pihole        pihole             334207 Apr  4 00:00 pihole.log.2.gz
-rw-r--r--  1 pihole        pihole             161139 Apr  3 00:00 pihole.log.3.gz
-rw-r--r--  1 pihole        pihole             108158 Apr  2 00:00 pihole.log.4.gz
-rw-r--r--  1 pihole        pihole             129892 Apr  1 00:00 pihole.log.5.gz
-rw-r--r--  1 root          root                 1249 Apr  4 04:41 pihole_updateGravity.log
drwx------  2 root          root                 4096 Oct 19 19:24 private
-rw-r-----  1 syslog        adm               5827268 Apr  6 20:25 syslog
-rw-r-----  1 syslog        adm               7957689 Apr  6 00:00 syslog.1
-rw-r-----  1 syslog        adm                299863 Apr  5 00:00 syslog.2.gz
-rw-r-----  1 syslog        adm                491704 Apr  4 00:00 syslog.3.gz
-rw-r-----  1 syslog        adm                371759 Apr  3 00:00 syslog.4.gz
-rw-r-----  1 syslog        adm                225491 Apr  2 00:00 syslog.5.gz
-rw-r-----  1 syslog        adm                218439 Apr  1 00:00 syslog.6.gz
-rw-r-----  1 syslog        adm                543051 Mar 31 00:00 syslog.7.gz
-rw-------  1 root          root              4099584 Apr  4 08:43 tallylog
-rw-------  1 root          root                    0 Oct 19 19:33 ubuntu-advantage.log
-rw-r-----  1 syslog        adm                108676 Apr  6 20:20 ufw.log
-rw-r-----  1 syslog        adm                126715 Apr  3 23:35 ufw.log.1
-rw-r-----  1 syslog        adm                  9246 Mar 28 23:21 ufw.log.2.gz
-rw-r-----  1 syslog        adm                 18528 Mar 26 07:18 ufw.log.3.gz
-rw-r-----  1 syslog        adm                  1863 Mar 21 23:32 ufw.log.4.gz
drwxr-x---  2 root          adm                  4096 Apr  1 00:00 unattended-upgrades
-rw-r-----  1 root          adm                218988 Apr  6 20:21 vsftpd.log
-rw-r-----  1 root          adm                316860 Apr  3 23:58 vsftpd.log.1
-rw-r-----  1 root          adm                 27116 Mar 29 00:00 vsftpd.log.2
-rw-r-----  1 root          adm                136611 Mar 28 00:00 vsftpd.log.3
-rw-r-----  1 root          adm                 23425 Mar 21 23:55 vsftpd.log.4
-rw-rw-r--  1 root          utmp               137472 Apr  6 17:56 wtmp
-rw-r--r--  1 root          root                16703 Feb 19 07:33 Xorg.0.log
-rw-r--r--  1 root          root                17098 Feb 19 07:30 Xorg.0.log.old
-rw-r--r--  1 root          root                17732 Dec 10 12:36 Xorg.1.log
-rw-r--r--  1 root          root                17465 Dec 10 12:35 Xorg.1.log.old
-rw-r-----  1 xrdp          adm             502174785 Apr  6 20:25 xrdp.log
-rw-r-----  1 root          adm                135129 Mar 20 01:11 xrdp-sesman.log
and
murad@murad:/var/log$ curl localhost:9200
{
  "name" : "node-1",
  "cluster_name" : "murad",
  "cluster_uuid" : "11NpBIUMRHGE4HgUxcTZzA",
  "version" : {
    "number" : "7.12.0",
    "build_flavor" : "default",
    "build_type" : "deb",
    "build_hash" : "78722783c38caa25a70982b5b042074cde5d3b3a",
    "build_date" : "2021-03-18T06:17:15.410153305Z",
    "build_snapshot" : false,
    "lucene_version" : "8.8.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"