I had a look and can find the content in the old branch for 8.7 
https://github.com/apache/lucene-solr/blob/branch_8_7/solr/solr-ref-guide/src/streaming-expressions.adoc
 but not elsewhere. Did you find documentation of the REST api such as 
'add-expressible' anywhere in the old guides?

Jan

> 14. nov. 2024 kl. 09:53 skrev Jan Høydahl <jan....@cominvent.com>:
> 
> Thanks.
> 
> You may find some assistance in contributing here 
> https://github.com/apache/solr/blob/main/dev-docs/how-to-contribute.adoc and 
> here https://github.com/apache/solr/tree/main/dev-docs/ref-guide 
> Ask here for help. And the Pull Request doesn't need to be perfect, it can be 
> polished during review.
> 
> Jan
> 
>> 13. nov. 2024 kl. 22:47 skrev Christine Feldmann 
>> <cfeldm...@proofpoint.com.INVALID>:
>> 
>> I haven’t yet contributed to the project but I should be able to figure that 
>> out.  I’ll get educated on the process and see if I can make it happen.  
>> Thanks!
>> 
>> From: Jan Høydahl <jan....@cominvent.com <mailto:jan....@cominvent.com>>
>> Reply-To: "users@solr.apache.org <mailto:users@solr.apache.org>" 
>> <users@solr.apache.org <mailto:users@solr.apache.org>>
>> Date: Wednesday, November 13, 2024 at 4:22 PM
>> To: "users@solr.apache.org <mailto:users@solr.apache.org>" 
>> <users@solr.apache.org <mailto:users@solr.apache.org>>
>> Subject: Re: Does lack of documentation indicate lack of support or just 
>> lack of documentation?
>> 
>> Never heard of such intent, likely a miss? Would you be willing to produce a 
>> Pull Request for bringing the content back? Jan Høydahl > On 13 Nov 2024, at 
>> 22: 03, Christine Feldmann <cfeldmann@ proofpoint. com. invalid> wrote: > >
>> 
>> 
>> Never heard of such intent, likely a miss? Would you be willing to produce a 
>> Pull Request for bringing the content back?
>> 
>> 
>> 
>> Jan Høydahl
>> 
>> 
>> 
>>> On 13 Nov 2024, at 22:03, Christine Feldmann 
>>> <cfeldm...@proofpoint.com.invalid> wrote:
>> 
>>> 
>> 
>>> 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://urldefense.com/v2/url?u=https-3A__issues.apache.org_jira_browse_SOLR-2D13105&d=DwIFaQ&c=Vxt5e0Osvvt2gflwSlsJ5DmPGcPvTRKLJyp031rXjhg&r=Z5eBKEaiuUFNG8HpjSz8IMDVdE51EhIEeAVWCJN74gY&m=SO3LQE6JmrHvOEeReChQNGw6Wr-qxiC6a0g-DZjNQc_dQi6bcMN1mBa8Y-RukmAd&s=wevHDVx3HmSX0XVNlxdqDZ14vY_Xnlp5kOtE2lQBv28&e=>
>>>  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://urldefense.com/v2/url?u=https-3A__lucene.apache.org_solr_8-5F5-5F0_solr-2Dsolrj_org_apache_solr_client_solrj_io_stream_expr_Expressible.html&d=DwIFaQ&c=Vxt5e0Osvvt2gflwSlsJ5DmPGcPvTRKLJyp031rXjhg&r=Z5eBKEaiuUFNG8HpjSz8IMDVdE51EhIEeAVWCJN74gY&m=SO3LQE6JmrHvOEeReChQNGw6Wr-qxiC6a0g-DZjNQc_dQi6bcMN1mBa8Y-RukmAd&s=X7MJTUSRrRYq0r18cEYkDMfZo-D_QXXClnhoU0XZqkA&e=>
>>>  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
> 

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