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https://issues.apache.org/jira/browse/SOLR-16305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17771510#comment-17771510
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Vincent Primault commented on SOLR-16305:
-----------------------------------------

I proposed a possible (but partial) improvement of the situation described here 
in https://issues.apache.org/jira/browse/SOLR-17006

> MODIFYCOLLECTION with 'property.*' changes can't change values used in config 
> file variables (even though they can be set during collection CREATE)
> ---------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-16305
>                 URL: https://issues.apache.org/jira/browse/SOLR-16305
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Chris M. Hostetter
>            Priority: Major
>         Attachments: SOLR-16305_test.patch
>
>
> Consider a configset with a  {{solrconfig.xml}} that includes a snippet like 
> this...
> {code:java}
> <str name="param.check">${custom.prop:customDefVal}</str>
> {code}
> ...this {{custom.prop}} can be set when doing a {{CREATE}} command for a 
> collection that uses this configset, using the {{property.*}} prefix as noted 
> in the reg-guide...
> {quote}{{property.{_}name{_}={_}value{_}}}
> |Optional|Default: none|
> Set core property _name_ to {_}value{_}. See the section [Core 
> Discovery|https://solr.apache.org/guide/solr/latest/configuration-guide/core-discovery.html]
>  for details on supported properties and values.
> {quote}
> ...BUT....
> These values can *not* be changed by using the {{MODIFYCOLLECTION}} command, 
> in spite of the ref-guide indicating that it can be used to modify custom 
> {{property.*}} attributes...
> {quote}The attributes that can be modified are:
>  * {{replicationFactor}}
>  * {{collection.configName}}
>  * {{readOnly}}
>  * other custom properties that use a {{property.}} prefix
> See the [CREATE 
> action|https://solr.apache.org/guide/solr/latest/deployment-guide/collection-management.html#create]
>  section above for details on these attributes.
> {quote}



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