private void closeOplogFileChannel(Region<?, ?> region) throws IOException {
    // Get the oplog handle & hence the underlying file & close it
    UninterruptibleFileChannel oplogFileChannel =
        getDiskRegion(region).testHook_getChild().getFileChannel();
    oplogFileChannel.close();
  }
Regression test for TRAC #41770: ConcurrentRegionOperationsJUnitTest fails with duplicate
create in an oplog
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegionJUnitTest.java