Looking for opinions here from those of you that know Solr best… A change was pushed to do a major revision of the Streaming Expressions guide almost 4 years ago in version 8.8: SOLR-13105<https://issues.apache.org/jira/browse/SOLR-13105> A visual guide to Solr Math Expressions and Streaming Expressions
In this change, the following section was removed: “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"/>” There was no mention of deprecating the feature or removing this section. Given the massive size of the diff, I wonder if it was 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 There is concern in my organization that this feature could be removed at any time without warning because it didn’t make it into the revision of the guide. Can anyone provide an opinion on how likely that is to happen? If any of the authors of the guide update are reading, can you comment on why that section was removed? Thanks in advance, Christine
