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https://issues.apache.org/jira/browse/SOLR-10992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16078296#comment-16078296
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Erick Erickson commented on SOLR-10992:
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I do see one issue here. First let me say I'm all for removing stopwords (+1, 
just to see if it's only a plus sign in the leading position that seems to get 
stripped lately). For that matter I'm also in favor of removing all the extra 
languages etc and super-especially the things like elevate that break 
startup.... OK, enough ranting.

I usually recommend to clients when they upgrade that they take the configs 
from the new version and copy/paste their changes over from their old 
configuration rather than just carry their old ones forward to a new version, 
especially when they're moving to a new major version.

This is going to bite them a bit as it's likely they'll overlook something like 
removing stopwords for the fields they use "as is", which many do (text_en 
comes to mind).

That said bout the max I'd advocate is a comment in the configs or maybe the 
upgrade notes in CHANGES.txt to the effect of "compare your schema definitions 
carefully since stopwords have been removed". Well, something better than that 
but you get the idea. I suppose it's one more incentive to re-index.

> the default for stopwords should be disabled
> --------------------------------------------
>
>                 Key: SOLR-10992
>                 URL: https://issues.apache.org/jira/browse/SOLR-10992
>             Project: Solr
>          Issue Type: Wish
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: config-api
>    Affects Versions: 6.6
>         Environment: All
>            Reporter: Rick Leir
>            Priority: Minor
>              Labels: beginner
>
> Suggest removing the stopword filter from the example configs. It is not a 
> “best practice” or even a recommended practice. 
> This was discussed in the user mailing list (link below).
> I chose the wrong component above, what should it have been?



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