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https://issues.apache.org/jira/browse/SOLR-12428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498568#comment-16498568
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Christine Poerschke commented on SOLR-12428:
--------------------------------------------

Thanks [~ichattopadhyaya] for bringing this up. Sounds good to me to add it to 
the {{_default}} configset.

Would the {{queryParser}}, {{cache}} and {{transformer}} elements be added too? 
Or would just the {{lib}} be present out-of-the-box leaving users to add the 
rest e.g. via the Config API (haven't tried that actually yet myself with LTR) 
using names of their choice?

https://lucene.apache.org/solr/guide/7_3/learning-to-rank.html#ltr-configuration

> Adding LTR jar to _default configset
> ------------------------------------
>
>                 Key: SOLR-12428
>                 URL: https://issues.apache.org/jira/browse/SOLR-12428
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Ishan Chattopadhyaya
>            Assignee: Ishan Chattopadhyaya
>            Priority: Major
>
> Even though Solr comes out of the box with the LTR capabilities, it is not 
> possible to use them in an existing collection without hand editing the 
> solrconfig.xml to add the jar. Many other contrib jars are already present in 
> the _default configset's solrconfig.xml.
> I propose to add the ltr jar in the _default configset's solrconfig:
> {code}
>   <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-ltr-\d.*\.jar" 
> />
> {code}
> Any thoughts, [~cpoerschke]?



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