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https://issues.apache.org/jira/browse/SOLR-16305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17569727#comment-17569727
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Chris M. Hostetter commented on SOLR-16305:
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I don't have a good solution for this, but I ran into this today (and it caused
me no end of confusion) so i wanted to make sure it was tracked.
IIUC the crux of the issue is that {{CREATE}} takes all these {{property.*}}
collection "attributes" and passes them to he underlying CoreAdmin API when
creating the cores – where they get baked into {{core.properties}} but there is
no corrisponding CoreAdmin API for modifying the contents of the
{{core.properties}} file, so there isn't really anything for
{{MODIFYCOLLECTION}} to do with them to update the existing cores.
(I'm not really clear why/how the docs for {{MODIFYCOLLECTION}} include
"other custom properties that use a {{property.}} prefix" in the list of
supported attributes since I can't think of any way this would have ever
worked?)
> 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
> Priority: Major
>
> 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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