Flaky Berkeley test: JanusGraphOperationCountingTest.testIdCounts

```java
[ERROR] Failures:
[ERROR] BerkeleyOperationCountingTest>JanusGraphOperationCountingTest.testIdCounts:109->JanusGraphOperationCountingTest.verifyStoreMetrics:410 org.janusgraph.sys.janusgraph_ids.getSlice.calls ==> expected: <6> but was: <5>
```

Job was:
```
MODULE='berkeleyje'
```

Start with JanusGraphOperationCountingTest.testIdCounts, especially the failure at line 109 and verifyStoreMetrics at line 410. Reproduce the BerkeleyJE job with MODULE='berkeleyje' and compare the expected six getSlice calls with the observed five; done means the test is no longer flaky and the operation count is consistently correct.

Written by the indexing model from the issue text.