The PostCommit Java Nexmark Dataflow V2 job is flaky

[github-actions]

The PostCommit Java Nexmark Dataflow V2 is failing over 50% of the time.
Please visit https://github.com/apache/beam/actions/workflows/beam_PostCommit_Java_Nexmark_Dataflow_V2.yml?query=is%3Afailure+branch%3Amaster to see all failed workflow runs.
See also Grafana statistics: http://metrics.beam.apache.org/d/CTYdoxP4z/ga-post-commits-status?orgId=1&viewPanel=4&var-Workflow=PostCommit%20Java%20Nexmark%20Dataflow%20V2

[github-actions]

Reopening since the workflow is still flaky

[Amar3tto]

Stabilized