Zachary Tong 86d6597890 Use newIndexSearcher() instead of newSearcher() (#45248)
`newSearcher()` from lucene can randomly choose index readers which
are not compatible with our tests, like ParallelCompositeReader.
The `newIndexSearcher()` method on AggregatorTestCase is a wrapper
similar to newSearcher but compatible with our tests
2019-08-08 09:34:38 -04:00
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