cc67d027de
Bringing together shards in a shrunken index means that we need to address the start of history for the shrunken index. The problem here is that sequence numbers before the maximum of the maximum sequence numbers on the source shards can collide in the target shards in the shrunken index. To address this, we set the maximum sequence number and the local checkpoint on the target shards to this maximum of the maximum sequence numbers. This enables correct document-level semantics for documents indexed before the shrink, and history on the shrunken index will effectively start from here. Relates #25321 |
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