Hello, is it possible to use only S3 for indexes storage?
No, it is not. You will need a node with local storage for indexing but can offload indices to S3 through searchable snapshots once they are read-only, but that is a commercial feature. The node handling the searchable snapshot does still require local disk for caching though, although all indices are stored on S3.
Elastic Cloud Serverless only charges for data stored in S3, so is close to what you are asking for, but that is a managed service.
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