BerkeleyElasticsearchTest.testIndexUpdatesWithoutReindex

## Flaky Test

* **Test Name:** BerkeleyElasticsearchTest.testIndexUpdatesWithoutReindex
* **Branch:** master
* **Notes:** Additional details about the test, e.g., theory as to failure cause

### Stack Trace

```
org.janusgraph.core.JanusGraphException: Index did not stabilize within the given amount of time. For sufficiently long wait periods this is most likely caused by a failed/incorrectly shut down JanusGraph instance or a lingering transaction.
```

Start with BerkeleyElasticsearchTest.testIndexUpdatesWithoutReindex and reproduce the reported stack trace on the master branch. Trace why the index does not stabilize and verify that the test passes reliably without the reported failure.

Written by the indexing model from the issue text.