[7.x][ML] Report cause when datafeed extraction encounters error (#66… #66277
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…stic#66167) When a datafeed encounters errors extracting data, often the error is an instance of `SearchPhaseExecutionException`. In that case the top level error message is `Partial shards failure` which is not very informative. This commit refactors a transform util method from `ExceptionRootCauseFinder`, which unwraps exceptions with special handling for `SearchPhaseExecutionException`, and makes use of it from datafeed `ProblemTracker` in order to provide a more useful error message. Backport of elastic#66167
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dimitris-athanasiou
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…167)
When a datafeed encounters errors extracting data, often
the error is an instance of
SearchPhaseExecutionException.In that case the top level error message is
Partial shards failurewhich is not very informative.
This commit refactors a transform util method from
ExceptionRootCauseFinder, which unwraps exceptions with specialhandling for
SearchPhaseExecutionException, and makes use ofit from datafeed
ProblemTrackerin order to provide a moreuseful error message.
Backport of #66167