cfeldmann created SOLR-17583:
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Summary: 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
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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