Problem started project with SpringBoot

I have a problem with the ElastichSearch integration with my springboot

org.elasticsearch.transport.NodeDisconnectedException: [][127.0.0.1:9300][cluster:monitor/nodes/liveness] disconnected

my file elastichsearch.yml to be active
cluster.name: my-cluster
node.name: node-1
path.logs: /var/log/elasticsearch
path.data: /var/lib/elasticsearch
network.host: 0.0.0.0

What are the elasticsearch server logs?
What are the versions?

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