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https://issues.apache.org/jira/browse/SOLR-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13771429#comment-13771429
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Hoss Man commented on SOLR-5252:
--------------------------------

bq. Currently, core.properties is moved to core.properties.unloaded on an 
UNLOAD command.

I may be wrong, but i vaguely remember a discussion about wether or not 
core.properties should support an "enable=true|false" property, and the 
decision ultimately being "no -- if people want to disable a core they should 
delete / rename the properties file"

I suspect that is why you are seeing the rename.

I would suggest that this decision be re-thunk: it would be better if 
enable=false in core.properties was supported and treated as if the 
core.properties did not exist on startup, but would allow the file to be reused 
(with enable=true automatically replaced with enable=true) on explicit CREATE 
actions.

* would help fix this bug: the UNLOAD code could leave the file was left in 
place, with enable=false added to it.  subsequent CREATE command would parse 
it,  add/change any explicit params set on CREATE and write it back out.
* it would allow people an easy way to say "here is a core dir that i don't 
want loaded by default on startup, but if it does get loaded via CREATE here 
are some props to use unless the CREATE command overrides them.


                
> SolrCloud core UNLOAD + CREATE
> ------------------------------
>
>                 Key: SOLR-5252
>                 URL: https://issues.apache.org/jira/browse/SOLR-5252
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Yonik Seeley
>
> Unloading a core and then loading it again doesn't work.

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