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https://issues.apache.org/jira/browse/BEAM-13137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17476243#comment-17476243
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Etienne Chauchot commented on BEAM-13137:
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yes I saw in the PR. better indeed to make it explicit

> make ElasticsearchIO$BoundedElasticsearchSource#getEstimatedSizeBytes 
> deterministic
> -----------------------------------------------------------------------------------
>
>                 Key: BEAM-13137
>                 URL: https://issues.apache.org/jira/browse/BEAM-13137
>             Project: Beam
>          Issue Type: Improvement
>          Components: io-java-elasticsearch
>            Reporter: Etienne Chauchot
>            Assignee: Evan Galpin
>            Priority: P2
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> Index size estimation is statistical in ES and varies. But it is the base for 
> splitting so it needs to be more deterministic because that causes flakiness 
> in the UTests in _testSplit_ and _testSizes_ and maybe entails sub-optimal 
> splitting in production in some cases.



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