Flaky HBase OLAP test: testVertexPartitionOlapCluster

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## Flaky Test

* **Test Name:** HBasePartitionGraphTest.testVertexPartitionOlapCluster
* **Link:** https://github.com/JanusGraph/janusgraph/blob/13619a181b7a64004a886223270d003dfdcbb4a0/janusgraph-backend-testutils/src/main/java/org/janusgraph/graphdb/JanusGraphPartitionGraphTest.java#L397
* **Branch:** master
* **Notes:**

### Stack Trace

```
Error: Tests run: 11, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 128.7 s <<< FAILURE! -- in org.janusgraph.graphdb.hbase.HBasePartitionGraphTest
Error: org.janusgraph.graphdb.hbase.HBasePartitionGraphTest.testVertexPartitionOlapCluster -- Time elapsed: 4.350 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <1> but was: <0>
at org.janusgraph.graphdb.JanusGraphPartitionGraphTest.testVertexPartitionOlap(JanusGraphPartitionGraphTest.java:443)
at org.janusgraph.graphdb.JanusGraphPartitionGraphTest.testVertexPartitionOlapCluster(JanusGraphPartitionGraphTest.java:398)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)

[INFO]
[INFO] Results:
[INFO]
Error: Failures:
Error: HBasePartitionGraphTest>JanusGraphPartitionGraphTest.testVertexPartitionOlapCluster:398->JanusGraphPartitionGraphTest.testVertexPartitionOlap:443 expected: <1> but was: <0>
```

Start with JanusGraphPartitionGraphTest.testVertexPartitionOlapCluster at line 398 and the testVertexPartitionOlap assertion at line 443, then run the HBasePartitionGraphTest to reproduce the failure. Investigate why the assertion intermittently observes 0 instead of 1; done means the test passes reliably without masking the reported condition.

Written by the indexing model from the issue text.