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Configuring OpenSearch
There are two types of OpenSearch settings: dynamic and static.
Dynamic settings
Dynamic index settings are settings that you can update at any time. You can configure dynamic OpenSearch settings through the Cluster Settings API. For details, see Update cluster settings using the API.
Whenever possible, use the Cluster Settings API; opensearch.yml is local to each node, whereas the API applies the setting to all nodes in the cluster.
Static settings
Certain operations are static and require you to modify the opensearch.yml configuration file and restart the cluster. In general, these settings relate to networking, cluster formation, and the local file system. To learn more, see Cluster formation.
Specifying settings as environment variables
You can specify environment variables as arguments using -E when launching OpenSearch:
./opensearch -Ecluster.name=opensearch-cluster -Enode.name=opensearch-node1 -Ehttp.host=0.0.0.0 -Ediscovery.type=single-node
Updating cluster settings using the API
The first step in changing a setting is to view the current settings by sending the following request:
GET _cluster/settings?include_defaults=true
For a more concise summary of non-default settings, send the following request:
GET _cluster/settings
Three categories of setting exist in the cluster settings API: persistent, transient, and default. Persistent settings, well, persist after a cluster restart. After a restart, OpenSearch clears transient settings.
If you specify the same setting in multiple places, OpenSearch uses the following precedence:
- Transient settings
- Persistent settings
- Settings from
opensearch.yml - Default settings
To change a setting, use the Cluster Settings API and specify the new value as either persistent or transient. This example shows the flat settings form:
PUT _cluster/settings
{
"persistent" : {
"action.auto_create_index" : false
}
}
You can also use the expanded form, which lets you copy and paste from the GET response and change existing values:
PUT _cluster/settings
{
"persistent": {
"action": {
"auto_create_index": false
}
}
}
Configuration file
You can find opensearch.yml in /usr/share/opensearch/config/opensearch.yml (Docker) or /etc/opensearch/opensearch.yml (most Linux distributions) on each node.
You can edit the OPENSEARCH_PATH_CONF=/etc/opensearch to change the config directory location. This variable is sourced from /etc/default/opensearch(Debian package) and /etc/sysconfig/opensearch(RPM package).
If you set your customized OPENSEARCH_PATH_CONF variable, be aware that other default environment variables will not be loaded.
You don’t mark settings in opensearch.yml as persistent or transient, and settings use the flat form:
cluster.name: my-application
action.auto_create_index: true
compatibility.override_main_response_version: true
The demo configuration includes a number of settings for the Security plugin that you should modify before using OpenSearch for a production workload. To learn more, see Security.
(Optional) CORS header configuration
If you are working on a client application running against an OpenSearch cluster on a different domain, you can configure headers in opensearch.yml to allow for developing a local application on the same machine. Use Cross Origin Resource Sharing so that your application can make calls to the OpenSearch API running locally. Add the following lines in your custom-opensearch.yml file (note that the “-“ must be the first character in each line).
- http.host:0.0.0.0
- http.port:9200
- http.cors.allow-origin:"http://localhost"
- http.cors.enabled:true
- http.cors.allow-headers:X-Requested-With,X-Auth-Token,Content-Type,Content-Length,Authorization
- http.cors.allow-credentials:true