[link to guide](https://docs.camunda.io/docs/next/self-managed/installation-methods/helm/configure/database/using-existing-opensearch/) * [ ] Guide updated and configuration is functional with 8.8 * [ ] Updated wording and terminology to 8.8 (orchestration cluster, management and modeling cluster, ...) * [ ] Consider [new template structure](https://github.com/camunda/camunda-docs/issues/6734) if applicable PR: https://github.com/camunda/camunda-docs/pull/6982