"stacktrace": ["org.apache.lucene.index.CorruptIndexException: compound sub-files must have a valid codec header and footer: file is too small (0 bytes) (resource=BufferedChecksumIndexInput)

That is more of a Kubernetes infrastructure question and not directly Elasticsearch related, so i will let someone else chime in.

Elasticsearch gives you high-availability itself (if properly configured), there's no need to do anything special at the storage layer. Sharing volumes across nodes is complex, unnecessary and often a source of problems so I would recommend not doing that.

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