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https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967046#action_12967046
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Grant Ingersoll commented on SOLR-1979:
---------------------------------------

bq. @Grant: I actually planned to do the regEx based field name mapping in a 
separate UpdateProcessor, to make things more flexible

I don't really see that it makes it any more flexible.  If it was a general 
purpose mapper, maybe, but since it is tied to the language field, why not just 
put in the language processor?  I've already got the method that choose the 
output field as a protected.  With that, one merely would need to extend it to 
provide an alternate method from what you have proposed.

> Create LanguageIdentifierUpdateProcessor
> ----------------------------------------
>
>                 Key: SOLR-1979
>                 URL: https://issues.apache.org/jira/browse/SOLR-1979
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Jan Høydahl
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: SOLR-1979.patch, SOLR-1979.patch
>
>
> We need the ability to detect language of some random text in order to act 
> upon it, such as indexing the content into language aware fields. Another 
> usecase is to be able to filter/facet on language on random unstructured 
> content.
> To do this, we wrap the Tika LanguageIdentifier in an UpdateProcessor. The 
> processor is configurable like this:
> {code:xml} 
>   <processor 
> class="org.apache.solr.update.processor.LanguageIdentifierUpdateProcessorFactory">
>     <str name="inputFields">name,subject</str>
>     <str name="outputField">language_s</str>
>     <str name="idField">id</str>
>     <str name="fallback">en</str>
>   </processor>
> {code} 
> It will then read the text from inputFields name and subject, perform 
> language identification and output the ISO code for the detected language in 
> the outputField. If no language was detected, fallback language is used.

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