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https://issues.apache.org/jira/browse/LUCENE-10381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482125#comment-17482125
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Greg Miller commented on LUCENE-10381:
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[~jpountz] your change looks right to me. Apologies for not thinking of this. 
It might be nice to default {{facetsConfig}} in {{IndexState}} to a new default 
instance if one isn't provided to be safe, but I don't think that's critically 
important. I haven't touched {{luceneutil}} yet so maybe I'll use this as a 
good opportunity to setup a dev environment for it and propose that change. 
Thanks again for jumping in here!

> Require users to provide FacetsConfig with initializing 
> DefaultSortedSetDocValuesReaderState
> --------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-10381
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10381
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Greg Miller
>            Priority: Minor
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> In LUCENE-10250, we added the ability for users to provide their 
> {{FacetsConfig}} when constructing 
> {{{}DefaultSortedSetDocValuesReaderState{}}}. This is necessary for some of 
> the new functionality and bug fixes in SSDV faceting (e.g., we need to know 
> if a dim is configured as hierarchical, multivalued and/or requiring dim 
> counts). To remain backwards-compatible, existing ctors were maintained and 
> users don't need to provide config, which means we have to fall back to some 
> default (pre-existing) behavior if we don't have the config.
> We should make the config mandatory going forward so that users always 
> explicitly provide their config. This is consistent with taxonomy faceting 
> where users must provide config. It's also pretty trappy to let users setup 
> their state without config as they might just overlook the need to provide it.



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