Finding the appropriate security privileges in Elasticsearch can be challenging, and this blog post outlines a method for determining required privileges through examples. The author demonstrates how to create a user with specific access to index-related functions, such as creating and updating documents, by iteratively adjusting privileges based on error messages received during attempted operations. This iterative process involves fine-tuning roles to grant necessary permissions for specific actions, like viewing index metadata and document creation, while highlighting the risks of using overly permissive roles. Additionally, the post provides an example of setting cluster-level permissions for accessing the Elastic homepage and ILM policies. The author emphasizes that there are numerous combinations of permissions, which makes it impractical to cover all scenarios with built-in roles and suggests trying this method in existing environments or Elastic Cloud.