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https://issues.apache.org/jira/browse/SOLR-5084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13734254#comment-13734254
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Robert Muir commented on SOLR-5084:
-----------------------------------

I think adding new values to the end of the list is no issue at all. neither is 
renaming labels.

but removing a legal value from the list, i think you need to reindex. Because 
what to do with documents that have that integer value?

in general i'm just trying to make sure we keep things sane here, so that the 
underlying shit is efficient.
                
> new field type - EnumField
> --------------------------
>
>                 Key: SOLR-5084
>                 URL: https://issues.apache.org/jira/browse/SOLR-5084
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Elran Dvir
>         Attachments: enumsConfig.xml, schema_example.xml, Solr-5084.patch, 
> Solr-5084.patch
>
>
> We have encountered a use case in our system where we have a few fields 
> (Severity. Risk etc) with a closed set of values, where the sort order for 
> these values is pre-determined but not lexicographic (Critical is higher than 
> High). Generically this is very close to how enums work.
> To implement, I have prototyped a new type of field: EnumField where the 
> inputs are a closed predefined  set of strings in a special configuration 
> file (similar to currency.xml).
> The code is based on 4.2.1.

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