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Does CSS Support APIs or Functions of Open-Source Elasticsearch?

Yes. Versions 5.5.1, 6.2.3, 6.5.4, 7.1.1, and 7.6.2 are supported. The Elasticsearch Cloud mode is adopted. Kibana can interconnect with Elasticsearch, and functions of open-source Elasticsearch 5.5.1, 6.2.3, 6.5.4, 7.1.1 and 7.6.2 are supported.