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https://issues.apache.org/jira/browse/SOLR-5017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704536#comment-13704536
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Yonik Seeley commented on SOLR-5017:
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bq. What if I to have a clean 'id' value which is devoid of extra information? 
Should I do id.substring(id.indexOf("!") everytime I use it elsewhere ?

Why would you have to do that?  If "!" appears in the ID field by accident 
sometimes, everything still works as expected with the compositeId router - 
that's why it's the default.
                
> Allow sharding based on the value of a field
> --------------------------------------------
>
>                 Key: SOLR-5017
>                 URL: https://issues.apache.org/jira/browse/SOLR-5017
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>
> We should be able to create a collection where sharding is done based on the 
> value of a given field
> collections can be created with shardField=fieldName, which will be persisted 
> in DocCollection in ZK
> implicit DocRouter would look at this field instead of _shard_ field
> CompositeIdDocRouter can also use this field instead of looking at the id 
> field. 

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