So apart from availability on client and server side, both Elasticsearch-service and data-plugin can be used for both get and set operations on ES data?
Afaik Data plugin mostly focused on data read (like search & query) and optimised to do it efficiently. It totally makes sense to use it for ES data reading but it might not cover particular your case.
Elasticsearch service gives you flexibility with access to Elasticsearch client APIs. So if you plan to write to your data indexes from Kibana, it should give you many options.
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