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https://issues.apache.org/jira/browse/SOLR-1536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrzej Bialecki  updated SOLR-1536:
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    Attachment:     (was: altering.patch)

> Support for TokenFilters that may modify input documents
> --------------------------------------------------------
>
>                 Key: SOLR-1536
>                 URL: https://issues.apache.org/jira/browse/SOLR-1536
>             Project: Solr
>          Issue Type: New Feature
>          Components: Schema and Analysis
>    Affects Versions: 1.5
>            Reporter: Andrzej Bialecki 
>         Attachments: altering.patch, altering.patch
>
>
> In some scenarios it's useful to be able to create or modify fields in the 
> input document based on analysis of other fields of this document. This need 
> arises e.g. when indexing multilingual documents, or when doing NLP 
> processing such as NER. However, currently this is not possible to do.
> This issue provides an implementation of this functionality that consists of 
> the following parts:
> * DocumentAlteringFilterFactory - abstract superclass that indicates that 
> TokenFilter-s created from this factory may modify fields in a 
> SolrInputDocument.
> * TypeAsFieldFilterFactory - example implementation that illustrates this 
> concept, with a JUnit test.
> * DocumentBuilder modifications to support this functionality.

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