[Transform] implement throttling in indexer#55011

Merged

hendrikmuhs merged 16 commits intoelastic:masterfrom hendrikmuhs:transform-throttling-part1

Apr 30, 2020

+535-166

Commits on Apr 28, 2020

implement throttling in indexer, to be used in transform
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checkstyle
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fix corner case issue when stop is called while a next search is scheduled
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all throttling members should be volatile
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check state more often and do not fire a search request in case of stopping
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expose wait time so rollup/transform can issue lightweight queries for
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fix test after stopping earlier
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improve code comment
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relax test
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use checkState to stop job
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use runOnce to workaround potential duplicate listener calls when re-throttling
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checkstyle
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formatting
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get maximumRequestsPerSecond via a getter instead of requiring a constructor
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address review comments
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renames requests_per_second to docs_per_second
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