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https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967076#action_12967076
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Robert Muir commented on SOLR-1979:
-----------------------------------
{quote}
It makes sense to allow for detecting languages outside 639-1, and I believe
RFC3066 and BCP47 are both re-using the 639 codes, so that if there is a
2-letter code for a language it will be used. 639-1 is what "everyone" already
knows.
In general, improvements should be done in Tika space, then use those in Solr,
thus building one strong language detection library.
{quote}
yes they do, the 639-1 codes that tika outputs are also valid BCP47 codes :)
but in solr, when designing up front, i was just saying we shouldn't limit any
abstract portion to 639-1 when another implementation might support 3066 or
BCP47... we should make sure we allow that.
> 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, 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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