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https://issues.apache.org/jira/browse/SOLR-17583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Høydahl updated SOLR-17583:
-------------------------------
    Labels: newdev  (was: )

> Bring back documentation for Adding Custom Expressions
> ------------------------------------------------------
>
>                 Key: SOLR-17583
>                 URL: https://issues.apache.org/jira/browse/SOLR-17583
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: documentation
>    Affects Versions: 9.7
>            Reporter: cfeldmann
>            Priority: Major
>              Labels: newdev
>
> A change was pushed to do a major revision of the Streaming Expressions guide 
> almost 4 years ago in version 8.8: SOLR-13105 A visual guide to Solr Math 
> Expressions and Streaming Expressions
>  
> In this change, the following section was removed:
>  
> {quote}Adding Custom Expressions
> Creating your own custom expressions can be easily done by implementing the 
> [Expressible|https://lucene.apache.org/solr/8_5_0/solr-solrj/org/apache/solr/client/solrj/io/stream/expr/Expressible.html]
>  interface. To add a custom expression to the list of known mappings for the 
> /stream and /graph handlers, you just need to declare it as a plugin in 
> solrconfig.xml via:
> <expressible name="custom" class="org.example.CustomStreamingExpression"/>
> {quote}
>  
> There was no mention of deprecating the feature or removing this section.  
> Given the massive size of the diff, it looks to be an inadvertent removal.
>  
> The feature works.  There’s no deprecation of this feature mentioned in any 
> of the Solr docs since it was removed from the guide without explanation.  
> The code itself is not deprecated.
>  
> The Config API doc still includes 
> add-expressible/update-expressible/delete-expressible
>  
> Since the feature still works, has not been deprecated and seems to have been 
> accidently removed from the documentation, let's bring this section back.



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