Yeah this not documented. Here are two links that will be helpful:
https://issues.apache.org/jira/browse/SOLR-9103
Slide 40 Shows the solrconfig.xml approach to registering new streams:
https://www.slideshare.net/lucidworks/creating-new-streams-presented-by-dennis-gove-bloomberg-lp
Joel
The documentation in the StreamHandler suggests adding into Solrconfig some
streamFunctions:
*
* org.apache.solr.client.solrj.io.stream.ReducerStream
* org.apache.solr.client.solrj.io.stream.RecordCountStream
*
HI,
I assume you are trying to add a custom extension,
not preparing a general purpose contribution for solr itself ...
We succeeded in loading a custom reduce operation by adding the jar
with our code:
And then defining an "expressible":
Both changes were made in solrconfig_extra.xml, a
