System index descriptors support mixed versions#71370
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jaymode merged 3 commits intoelastic:7.xfrom Apr 7, 2021
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System index descriptors are used to describe a system index, which are expected to change as new versions are developed. As part of this, the descriptors had a minimum supported version field so that the contents within that descriptor would not be applied if there were nodes older than that version. However, this falls short of being able to accurately describe what a system index should look like in a given cluster where there are mixed node versions. This change moves us towards being able to accurately describe and know what the system index should look like. A system index is now able to accept a list of the prior system index descriptor objects so that clusters with mixed versions can select the appropriate descriptor and ensure the index is created properly. As the node versions change during a rolling upgrade, the cluster will then be able to adapt the system index to the most recent version once all master and data nodes have been upgraded. Co-authored-by: Tim Vernum <tim@adjective.org> Co-authored-by: Yang Wang <ywangd@gmail.com> Backport of elastic#71144
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System index descriptors are used to describe a system index, which are
expected to change as new versions are developed. As part of this, the
descriptors had a minimum supported version field so that the contents
within that descriptor would not be applied if there were nodes older
than that version. However, this falls short of being able to
accurately describe what a system index should look like in a given
cluster where there are mixed node versions.
This change moves us towards being able to accurately describe and
know what the system index should look like. A system index is now
able to accept a list of the prior system index descriptor objects
so that clusters with mixed versions can select the appropriate
descriptor and ensure the index is created properly. As the node
versions change during a rolling upgrade, the cluster will then be
able to adapt the system index to the most recent version once all
master and data nodes have been upgraded.
Co-authored-by: Tim Vernum tim@adjective.org
Co-authored-by: Yang Wang ywangd@gmail.com
Backport of #71144