[8.18] Conditionally use sequential stored field reader in LuceneSyntheticSourceChangesSnapshot #122201
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…urceChangesSnapshot (elastic#121636) Improve LuceneSyntheticSourceChangesSnapshot by triggering to use a sequential stored field reader if docids are dense. This is done by computing for which docids to synthesize recovery source for. If the requested docids are dense and monotonic increasing a sequential stored field reader is used, which provided recovery source for many documents without repeatedly de-compressing the same block of stored fields.
martijnvg
added
backport
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Backporting #121636 to 8.18 branch.
Improve LuceneSyntheticSourceChangesSnapshot by triggering to use a sequential stored field reader if docids are dense. This is done by computing for which docids to synthesize recovery source for. If the requested docids are dense and monotonic increasing a sequential stored field reader is used, which provided recovery source for many documents without repeatedly de-compressing the same block of stored fields.