Troubleshooting Tip: ElasticSearch does not come up after upgrading to FortiSOAR 7.3.1

[nmathur]

Description	This article describes that ElasticSearch service does not come up after upgrading to FortiSOAR 7.3.1, and the ElasticSearch logs contain the following error: 'cannot upgrade node because incompatible indices created with version'.
Scope	FortiSOAR 7.3.1.
Solution	To resolve this issue, do the following: 1) SSH to the FortiSOAR VM and log in as a root user. 2) Stop the Elasticsearch service using the following command:  systemctl stop elasticsearch 3) Delete the 'nodes' and 'indices' folders from the:  /var/lib/elasticsearch folder. 4) Start the Elasticsearch service using the following command:  systemctl start elasticsearch 5) Re-run indexing using the following command:  sudo -u nginx php /opt/cyops-api/bin/console app:elastic:create Note: It is recommended to reindex FortiSOAR during non-working hours.