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https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967011#action_12967011
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Grant Ingersoll commented on SOLR-1979:
---------------------------------------

Another thought, here, is that, over time, this class becomes a base class and 
it becomes easy to replace the language detection piece, that way one gets all 
the infrastructure of this class, but can plugin their own detection.  In fact, 
I'm going to do that right now.

> 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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