Elasticsearch 403 FORBIDDEN Index read-only Error 처리

Elastic Stack을 운영중 data node 용량 문제로 아래와 같은 에러 로그를 발견. 해결책에 대하여 알아보자. org.elasticsearch.xpack.monitoring.exporter.ExportException: ClusterBlockException[blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];] Caused by: org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; 1. Elasticsearch Error Logs elastic master node l..