Configuring Default Parameters in the .yml Configuration File of an Elasticsearch Cluster

Configuring the .yml File

1. Log in to the CSS management console.
2. In the navigation pane on the left, choose Clusters > Elasticsearch.
3. In the cluster list, click the name of the target cluster. The cluster information page is displayed.
4. Choose Cluster Settings > Parameter Settings.
5. Click Edit to modify module parameters as required.

   Table 1 Module parameters

   Module Name	Parameter	Description
   Cross-domain Access	http.cors.allow-credentials	Whether to carry authentication information in cross-domain requests, that is, whether to contain the Access-Control-Allow-Credentials field in the response header. The value can be: true: The response header contains the Access-Control-Allow-Credentials field. false (default value): The response header does not contain the Access-Control-Allow-Credentials field.
   	http.cors.allow-origin	Source IP addresses or domain names allowed for cross-domain access. When there are multiple values, separate them with commas (,). Example: 192.168.122.122:9200 or 192.168.1.1:9200, 192.168.1.2:9200
   	http.cors.allow-headers	Request header fields for cross-domain access. When there are multiple values, separate them using a comma (,) and a space. Example: X-Requested-With, Content-Type, Content-Length The value can contain a maximum of 1024 characters. It can only contain letters, digits, hyphens (-), underscores (_), colons (:), and slashes (/).
   	http.cors.max-age	Maximum retention duration of pre-check responses in the browser cache. Unit: s Value range: 0 to 31,536,000 (0 to 1 year) Default value: 1,728,000 (20 days)
   	http.cors.enabled	Whether to enable cross-domain access. The value can be: true: Enable cross-domain access. false (default): Disable cross-domain access.
   	http.cors.allow-methods	HTTP methods allowed for cross-domain access. When there are multiple values, separate them using a comma (,) and a space. Example: OPTIONS, GET, POST Value range: OPTIONS, HEAD, GET, POST, PUT, and DELETE
   Reindexing	reindex.remote.whitelist	Which remote hosts are allowed for remote reindexing operations. Use commas (,) to separate multiple values. Example: 192.168.122.122:9200 or 192.168.1.1:9200, 192.168.1.2:9200
   Custom Cache	indices.queries.cache.size	Maximum heap space allocated to the query cache. Unit: percentage (%) Value range: 1 to 100 Default value: 10%
   Queue Size in a Thread Pool	thread_pool.force_merge.size	Size of the thread pool used for force merge operations. Value range: a positive integer Default value: 1
   Custom	Custom parameters	You can add any custom parameters supported by Elasticsearch. The parameter values must meet the following requirements: If a custom parameter has multiple values, use a comma (,) and a space to separate them. The input format is [value1, value1, value1...]. Colons (:) are not allowed. WARNING: Set the values of any custom parameters to those supported by Elasticsearch. Otherwise, the cluster may fail to restart. Exercise caution when performing this operation.

6. After the change is complete, click Submit.In the displayed dialog box, confirm the settings, select the box indicating "I understand that the modification will take effect after the cluster is restarted." and click Yes.

   If the Status is Succeeded in the parameter modification list, the modification has been saved. Up to 20 modification records can be displayed.

7. Click Restart in the upper right corner to restart the cluster, thus making the change take effect.
   • You need to restart the cluster after modification, or Configuration not updated will be displayed in the Task Status column in the cluster list.
   • If you restart the cluster after the modification, and Task Status displays Configuration error in the cluster list, the parameter configuration file has failed to be modified.