Elasticsearch built-in security features are not enabled. Without authentication, your cluster could be accessible to anyone

. Do you have any suggestions to secure a Elasticsearch cluster?

Yes, there are several ways to secure an Elasticsearch cluster. Here are some suggestions:

1. Enable authentication and authorization for Elasticsearch using the built-in security features. This will require users to authenticate before they can access the cluster, and you can specify which users have access to which resources.

2. Use Transport Layer Security (TLS) encryption to secure communication between nodes in the cluster. This will prevent eavesdropping and data tampering.

3. Limit network access to the cluster. Only expose the necessary ports and IP addresses to minimize the attack surface.

4. Regularly monitor the cluster for suspicious activity using logging and auditing tools.

5. Implement access control policies to restrict access to sensitive data within the cluster.

It's important to note that these suggestions should be tailored to your specific use case and security needs. It's always a good idea to consult with a security professional to ensure that your Elasticsearch cluster is adequately secured.