[Transform] Improve robustness when saving state#62086

Merged

hendrikmuhs merged 21 commits intoelastic:masterfrom

hendrikmuhs:transform-saveState

Sep 28, 2020

Commits on Sep 23, 2020

refactor how state is persisted, so it can not be called from more than 1
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unmute integration tests
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enhance the integration test to do several runs with start and stop
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apply review comments
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ensure saveState listeners are called in either case and fix concurrency
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remove superflous line
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Call listener immediately if indexer is not indexing or value hasn't changed.
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add module tests for shopAtCheckpoint
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add file headers
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persist state if indexer state is started
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log if state persistance fails
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do not block the network thread
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adapt tests, so it does not assert on the threadpool
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add testcase for throttling
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assert that state has been persisted with shouldStopAtCheckpoint
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ensure listeners are called if transform stops
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add back synchronized to setShouldStopAtCheckpoint to avoid problems
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do not call action listener onResponse inside getAndUpdate
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simplify by using updateAndGet
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make updateAndGet free of side effects
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do not call listener from synchronized block
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