[jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor

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[jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor

Sebastian Nagel (Jira)

    [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968757#action_12968757 ]

Grant Ingersoll commented on SOLR-1979:
---------------------------------------

Have a look at http://tika.apache.org/0.8/detection.html

Really, though, you need to dig into the Tika class: LanguageIdentifier.  Adding languages, AFAICT, involves building the model accordingly and then letting Tika know about it via a properties file.

> Create LanguageIdentifierUpdateProcessor
> ----------------------------------------
>
>                 Key: SOLR-1979
>                 URL: https://issues.apache.org/jira/browse/SOLR-1979
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Jan H√łydahl
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: SOLR-1979.patch, 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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