Cao Manh Dat resolved SOLR-12176.
       Resolution: Fixed
    Fix Version/s: 7.4

> Improve FORCELEADER to handle the case when a replica win the election but 
> does not present in clusterstate
> -----------------------------------------------------------------------------------------------------------
>                 Key: SOLR-12176
>                 URL: https://issues.apache.org/jira/browse/SOLR-12176
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Cao Manh Dat
>            Assignee: Cao Manh Dat
>            Priority: Major
>             Fix For: 7.4
>         Attachments: SOLR-12176.patch
> There can be the case when a replica wins the election but it does not 
> present in clusterstate. Maybe when the Overseer sent the UNLOAD request to 
> the LEADER (in DeleteReplicaCmd), it met some exception (therefore the 
> request never reach the LEADER), the Overseer it that case will forcefully 
> remove the LEADER from clusterstate. 
> If a shard reaches that case, users will only see a leaderless shard and call 
> FORCELEADER won't be able to solve their problem. Therefore FORCELEADER 
> should be more robust, to handle such cases.

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