[Transform] Improve robustness of checkpointing#80984

Merged

hendrikmuhs merged 28 commits intoelastic:masterfrom hendrikmuhs:transform-checkpointing-refactor

Feb 17, 2022

+1,401-51

Commits on Feb 15, 2022

rewrites checkpointing as internal actions, reducing several sub-calls to
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implement switch for default and fallback
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fix doc string
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use transport to target node directly instead of using a client
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fix tests
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rename the integration test for legacy checkpoints
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spotlessApply
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swith the checkpoint action to admin, as it has to be called with user credentials,
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change the shard action, too
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fix branch logic
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initialize sequence number array with unassigned
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remove debug log
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add tests
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improve naming
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add test for merging node results
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checkstyle
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add tests for multinode checkpointing
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Apply suggestions from code review

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apply review comment
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make checkpoint node operation internal
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update doc comments
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overhaul privilige checking
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make GetCheckpointNodeAction an IndicesRequest
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add logging
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add code comments
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fix mixed version issue
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disable remote indizes explicitly and explain why, use shorter call for resolving indices.
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document the access control check
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