[8.14] Re-define index.mapper.dynamic setting in 8.x (#109341) #109564
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Currently when upgrading a 7.x cluster to 8.x with `index.mapper.dynamic` index setting defined the following happens: - In case of a full cluster restart upgrade, then the index setting gets archived and after the upgrade the cluster is in a green health. - In case of a rolling cluster restart upgrade, then shards of indices with the index setting fail to allocate as nodes start with 8.x version. The result is that the cluster has a red health and the index setting isn't archived. Closing and opening the index should archive the index setting and allocate the shards. The change is about ensuring the same behavior happens when upgrading a cluster from 7.x to 8.x with indices that have the `index.mapper.dynamic` index setting defined. By re-defining the `index.mapper.dynamic `index setting with `IndexSettingDeprecatedInV7AndRemovedInV8` property, the index is allowed to exist in 7.x indices, but can't be defined in new indices after the upgrade. This way we don't have to rely on index archiving and upgrading via full cluster restart or rolling restart will yield the same outcome. Based on the test in elastic#109301. Relates to elastic#109160 and elastic#96075
martijnvg
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:StorageEngine/Mapping
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Backports the following commits to 8.14: