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    Type:Task 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: backend, continuous integration, documentation
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        S
Context:
In Optimize, we're only supporting those Elasticsearch versions that are still maintained by Elastic. See https://www.elastic.co/support/eol. With 3.3, the Elasticsearch 7.0, 7.1, and 7.2 reach their end of life. We should remove them from the support.
AT:
- the jenkins pipeline for the ES support is adjusted to discontinuing the testing for 7.0. 7.1, and 7.2
- there's an error thrown if Optimize is connected to one of the unsupported Elasticsearch versions
- the documentation is adjusted (supported environments, announcements, upgrade guide)