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0df12a8580
Today we fail the node at startup if it contains an index that is too old to be compatible with the current version, unless that index is closed. If the index is closed then the node will start up and this puts us into a bad state: the index cannot be opened and must be reindexed using an earlier version, but we offer no way to get that index into a node running an earlier version so that it can be reindexed. Downgrading the node in-place is decidedly unsupported and cannot be expected to work since the node already started up and upgraded the rest of its metadata. Since #41731 we actively reject downgrades to versions ≥ v7.2.0 too. This commit prevents the node from starting in the presence of any too-old indices (closed or not). In particular, it does not write any upgraded metadata in this situation, increasing the chances an in-place downgrade might be successful. We still actively reject the downgrade using #41731, because we wrote the node metadata file before checking the index metadata, but at least there is a way to override this check. Relates #21830, #44230 |
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| apis | ||
| migrate_8_0 | ||
| index.asciidoc | ||
| migrate_8_0.asciidoc | ||
| migration.asciidoc | ||