Context:
When Optimize 3.4.0 is released, Elasticsearch 7.3.0 and 7.4.0 already reached their end of life:
https://www.elastic.co/support/eol
AT:
- Elasticsearch test version is raised to 7.5.0
- 7.3 and 7.4 are removed from supported versions in the version checker
- 7.11 is added to supported versions in the version checker
- integration tests are extended with 7.11
- Supported Environment in docs are updated accordingly
- drop of support for 7.3.0 and 7.4.0 is announced
- drop of support for 7.3.0 and 7.4.0 is listed in the update notes to 3.4.0