Can I Modify the TLS Algorithm of an Elasticsearch or OpenSearch Cluster in CSS?

The TLS algorithm can be modified for Elasticsearch 7.6.2 and later as well as OpenSearch clusters.

1. Log in to the CSS management console.
2. In the navigation pane, choose Clusters. The cluster list is displayed.
3. Click the name of the target cluster to go to the cluster details page.
4. Select Parameter Configurations, click Edit, expand the Customize parameter, and click Add.
   • For an Elasticsearch cluster, add the opendistro_security.ssl.http.enabled_ciphers parameter and set it to ['TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256', 'TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384'].
   • For an OpenSearch cluster, add the plugins.security.ssl.http.enabled_ciphers parameter and set it to ['TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256', 'TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384'].
   

   If the parameter value contains multiple algorithm protocols, enclose the value with a pair of square brackets ([]). If the parameter value is a single algorithm protocol, enclose the value with a pair of single quotation marks(' ').

5. After the change is complete, click Submit.In the displayed Submit Configuration dialog box, 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 change list, the change has been saved.

6. Return to the cluster list and choose More > Restart in the Operation column to restart the cluster and make the change take effect.