Elasticsearch in Docker : WARN "this node is locked into cluster UUID" on container restart

Elastic Stack Elasticsearch
1

Hello,
I use Elasticsearch 8.7.1 in an official Docker container.
I export the data (/usr/share/elasticsearch/data/) to the host to keep indexing data.
If I delete the container (for update for example), when I recreate it with the same configuration parameters, I see the following alert in the logs:
log.level": "WARN", "message":"this node is locked into cluster UUID [zRB-tYxKTzCKz19RMWeTng] but [cluster.initial_master_nodes] is set to [my-elasticsearch-01]; remove this setting to avoid possible data loss caused by subsequent cluster bootstrap attempts;
I specify that the "cluster.initial_master_nodes" parameter is not declared, neither in the elasticsearch.yml configuration file, nor in my docker-compose file.
Here are the parameters I include in my docker-compose file:

      - discovery.type=single-node
      - node.name=my-elasticsearch-01
      - cluster.name=my-elastic-cluster
      - network.host=0.0.0.0
      - xpack.security.enabled=false
      - xpack.security.transport.ssl.enabled=false
      - xpack.license.self_generated.type=basic
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"

I notice that I don't get this alert if I don't export the data to the host or delete the data before recreating the container.
I have the impression that it does not accept my old data.
What is going on ?
How do I get Elasticsearch to accept my old index data?

THANKS !

2

It's declared somewhere. To avoid this warning, work out where and remove it.

3

In the container: grep "initial_master_nodes" /usr/share/elasticsearch/* -ral returns nothing. I checked the environment variables in the image and in the container: no match either. My compose file does not contain this parameter. Is there any other place to look?

4

Not sure, sorry, Docker does make this kind of thing hard to track down. But Elasticsearch is seeing the value my-elasticsearch-01 which definitely looks like something you've configured rather than something it might invent.

5

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