Use propagation for error handling

[buinauskas]

Type of PR

• Documentation changes
• Code changes
• Test changes
• CI-CD changes
• GitHub Template changes

Purpose of PR

We do have some weird exceptions saying that 0 hits were fed successfully. I find it hard to replicate in code with my current Java knowledge. I suspect that can come from weird error handling and the fact I barely know how to work with Java completion stages. Error propagation seems a better approach to conditionally handle exceptions than throwing exceptions inside completion stages.

Testing

The current test suite passes just fine.

Review notes

Issues Closed or Referenced

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