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The configuration format is [YAML](https://yaml.org/). Here is an example of changing the path of the data and logs directories in {{es}}:
The `elasticsearch.yml` configuration format is [YAML](https://yaml.org/). Here is an example of changing the path of the data and logs directories in {{es}}:

```yaml
path:
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Environment variables referenced with the `${...}` notation within the configuration file will be replaced with the value of the environment variable. For example:
Environment variables referenced with the `${...}` notation within the `elasticsearch.yml` configuration file will be replaced with the value of the environment variable. For example:

```yaml
node.name: ${HOSTNAME}
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Expand Up @@ -32,8 +32,8 @@ For a list of settings that must be configured before using your cluster in prod
{{es}} has three configuration files:

* `elasticsearch.yml` for configuring {{es}}
* `jvm.options` for configuring {{es}} JVM settings
* `log4j2.properties` for configuring {{es}} logging
* `jvm.options` for configuring {{es}} [JVM settings](elasticsearch://reference/elasticsearch/jvm-settings.md)
* `log4j2.properties` for configuring [{{es}} logging](/deploy-manage/monitor/logging-configuration/elasticsearch-log4j-configuration-self-managed.md)

These files are located in the config directory, whose default location depends on whether the installation is from an archive distribution (`tar.gz` or `zip`) or a package distribution (Debian or RPM packages).

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* [](/deploy-manage/manage-connectors.md): Manage connection information between Elastic and third-party systems.
* [](/deploy-manage/remote-clusters.md): Enable communication between {{es}} clusters to support [cross-cluster replication](/deploy-manage/tools/cross-cluster-replication.md) and [cross-cluster search](/solutions/search/cross-cluster-search.md).
* [](/deploy-manage/maintenance/add-and-remove-elasticsearch-nodes.md): Learn how to add or remove nodes to change the size and capacity of your cluster.
* [](/deploy-manage/production-guidance.md): Review tips and guidance that you can use to design a production environment that matches your workloads, policies, and deployment needs.
* [](/deploy-manage/production-guidance.md): Review tips and guidance that you can use to design a production environment that matches your workloads, policies, and deployment needs.
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