Chris M. Hostetter created SOLR-16305:
-----------------------------------------

             Summary: 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
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Chris M. Hostetter


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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