Read-Only On Replica

Elastic Stack Elasticsearch
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If the primary shard and the replica share the same data files, and make the copy read-only. What is the best way to use ？

I found that the engine was initialized based on the index level when the node started. Whether the read-only engine can be used for the replica in IndexShard, and the engine initialized at node startup can be discarded？

Are there any other risks besides data loss？

I just want the replica to be read-only.

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