Fix ActionRequestValidationException

✅ Solution

ActionRequestValidationException usually indicates a mismatch or missing configuration between Elasticsearch nodes or clusters, often related to security settings or inter-cluster communication. To fix it, verify that security is properly configured for cross-cluster search, including TLS certificates and user authentication, and ensure that cluster names in the search request match the remote cluster configurations exactly. Double-check that remote clusters have the correct `cluster.remote.[cluster_alias].seeds` settings in their `elasticsearch.yml` configuration files.