This is not a question, but after almost ten mails with an Elastic employee, i think that could be usefull to other people.
The start of the mails was to understand what mean end of live and end of support.
What i concluded is :
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The duration between two GA is almost one year , instead of 1,5 year as it is written on web site
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Minor version changes the second digit and is increased for new features, as it is explained on web site ( https://www.elastic.co/fr/support/eol )
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Debug version changes the third digit and is increased for debug, as it is explained on web site
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End of Life means that no more minor version is published
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End of support means that no more debug version is published
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After a GA, until the release of the GA+1, minor versions are published. In other words until the end of life, minor versions are published. In other words, during one year after the GA minor versions are published.
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For example, the 7.0.0 is released 2019/04, 7.X are published until the release of 8.0.0 id 2020/04 ( 2019/10+1).
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Debug versions of the last minor are published until the end of support, that's the release of the GA+2.
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The last debug version of a 7.X could be published until the release of the 9.0.0 (7+2): 2021/04 (one year after the 8.0.0).
I hoppe that's can help.