LUCENE-8865: Move to executor in IndexSearcher #731
Merged
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In order to simplify testing this change moves to use the Executor
interface instead of ExecutorService. This change also simplifies
customizing execute methods for use-cases that need to add additional
logic for forking to new threads. This change also adds a test for
the optimization added in LUCENE-8865.
This change is fully backwards compatible since ExecutorService implements
Executor.