Elasticsearch on AtoM 2.5 fails to start

[Jonathan Sinclair]

I am trying to upgrade an old installation from 2.4 and have installed AtoM 2.5 on Ubuntu 18.04. AtoM is now installed, however I cannot set up the initial database as Elasticsearch is not running: 

• Can't connect to the server (Failed to connect to localhost port 9200: Connection refused). 

Is there a way to get the service started?

 elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: failed (Result: signal) since Mon 2025-12-01 12:00:07 EST; 33s ago
     Docs: http://www.elastic.co
  Process: 1109 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet -Edefault.path.logs=${LOG_DIR} -Edefault.path.data=${DATA_DIR} -Edefault.path.conf=${CONF_DIR} (code=killed, signal=KILL)
  Process: 1100 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
 Main PID: 1109 (code=killed, signal=KILL)