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SOLR-17583: Bring back documentation for Adding Custom Expressions #2904

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Dec 12, 2024
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SOLR-17583: Bring back documentation for Adding Custom Expressions #2904

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9 changes: 9 additions & 0 deletions solr/solr-ref-guide/modules/query-guide/pages/streaming-expressions.adoc
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Expand Up @@ -100,6 +100,15 @@ In your JSON client you'll need to iterate each doc (tuple) and check for the EO

Timeouts for Streaming Expressions can be configured with the `socketTimeout` and `connTimeout` startup parameters.

=== Adding Custom Expressions

Creating your own custom expressions can be easily done by implementing the {solr-javadocs}/solrj-streaming/org/apache/solr/client/solrj/io/stream/expr/Expressible.html[Expressible] 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:

[source,xml]
<expressible name="custom" class="org.example.CustomStreamingExpression"/>


== Elements of the Language

=== Stream Sources
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