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https://issues.apache.org/jira/browse/SOLR-5209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756714#comment-13756714
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Shalin Shekhar Mangar commented on SOLR-5209:
---------------------------------------------

I think this deserves another look. We have the deleteshard API now which can 
be used to completely remove a slice from the cluster state. We should remove 
this trappy behaviour.
                
> cores/action=UNLOAD of last replica removes shard from clusterstate
> -------------------------------------------------------------------
>
>                 Key: SOLR-5209
>                 URL: https://issues.apache.org/jira/browse/SOLR-5209
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 4.4
>            Reporter: Christine Poerschke
>         Attachments: SOLR-5209.patch
>
>
> The problem we saw was that unloading of an only replica of a shard deleted 
> that shard's info from the clusterstate. Once it was gone then there was no 
> easy way to re-create the shard (other than dropping and re-creating the 
> whole collection's state).
> This seems like a bug?
> Overseer.java around line 600 has a comment and commented out code:
> // TODO TODO TODO!!! if there are no replicas left for the slice, and the 
> slice has no hash range, remove it
> // if (newReplicas.size() == 0 && slice.getRange() == null) {
> // if there are no replicas left for the slice remove it

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