Fork FirstPassGroupingCollector into a custom single pass collector #79224
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This change rewrites the CollapsingTopDocsCollector into a SinglePassGroupingCollector. Relying on Lucene's FirstPassGroupingCollector is not safe, we have no guarantee that the underlying implementation will not break our custom extension in the future. It is also a blocker for the modularization of Elasticsearch since the extension class needs to access a Lucene's package protected field. So this commit forks the code of the FirstPassGroupingCollector into a specialized collector that we can control.
jimczi
added
>non-issue
:Search/Search
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Pinging @elastic/es-search (Team:Search) |
ChrisHegarty
approved these changes
Oct 15, 2021
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This looks great @jimczi, thanks for taking it on. Much appreciated. ( please wait for a second more knowledgable area-specific reviewer )
romseygeek
approved these changes
Oct 15, 2021
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This change rewrites the CollapsingTopDocsCollector into a
SinglePassGroupingCollector.
Relying on Lucene's FirstPassGroupingCollector is not safe,
we have no guarantee that the underlying implementation will
not break our custom extension in the future.
It is also a blocker for the modularization of Elasticsearch
since the extension class needs to access a Lucene's package
protected field.
So this commit forks the code of the FirstPassGroupingCollector
into a specialized collector that we can control.