Elasticsearch service has been terminated and fails to restart. The error returned is
Job for elasticsearch.service failed because the control process exited with error code. See "systemctl status elasticsearch.service" and "journalctl -xe" for details.
The log says
org.elasticsearch.bootstrap.StartupException: ElasticsearchException[failed to bind service]; nested: CorruptIndexException[Unexpected file read error while reading index. (resource=BufferedChecksumIndexInput(SimpleFSIndexInput(path="/var/lib/elasticsearch/nodes/0/_state/segments_11mz")))]; nested: NoSuchFileException[/var/lib/elasticsearch/nodes/0/_state/_kfz.si];
I can confirm that the file
/var/lib/elasticsearch/nodes/0/_state/_kfz.si is indeed missing.
How can I recover Elasticsearch to a state where I can restart it?