How to share custom Elasticsearch plugin specific data across nodes

How to share custom Elasticsearch plugin-specific data across nodes. Our plugin uses the temp filesystem to store data which would be re-used, how do I share this across multiple nodes in an Elasticsearch cluster without using the file system. What persistent operations are available to support this, should we use a shared filesystem or relational database based persistence. What are the best practices here?

We would want to backup and restore this custom plugin-specific data if we migrate or upgrade our Elasticsearch clusters

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