Simplify Engine construction and ref counting #9211
Merged
+96
−113
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Today the internal engine closes itself it the engine hits an exception
it can not recover from. This complicates a lot of refcounting issues
if such an exception happens during engine creation. This commit
only markes the engine as failed and let the user close it once the exception
bubbles up. Additionally it rolls back the indexwriter to prevent any changes after
the engine is failed.