@Override
      public void goingToFlush() {
        if (!alreadyComeHere) {
          try {
            region.destroy("Key");
          } catch (Exception e) {
            logWriter.error("Exception occurred", e);
            fail("Exception occurred when it was not supposed to occur");
          }
        }
        alreadyComeHere = true;
      }
the entry which is about to be flushed is deleted
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/ConcurrentFlushingAndRegionOperationsJUnitTest.java