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All of the data is replicated to Elastic Search, but is not held there by default. The indexes and such are created, but the documents are discarded. Elastic Search is not a database and does not perform like one and certainly not on the level of Couchbase. Take a look at this presentation where it talks about performance and stuff and why Cochbas

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If your data are not critical or if you have another source of truth, you can use Elasticsearch only.

Otherwise, I'd keep Couchbase and Elasticsearch. There is a resiliency page on Elastic.co website which describes potential known problems. https://www.elastic.co/guide/en/elasticsearch/resiliency/current/index.html

My 2 cents.


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