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https://issues.apache.org/jira/browse/UIMA-2126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marshall Schor closed UIMA-2126.
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> Update of the Lucene libraries to version 2.9.3. Addition of an attribute for
> field definitions in the mapping file to make this field unique in the
> resulting index.
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: UIMA-2126
> URL: https://issues.apache.org/jira/browse/UIMA-2126
> Project: UIMA
> Issue Type: Improvement
> Components: Sandbox-Lucas
> Reporter: Erik Faessler
> Priority: Minor
> Fix For: 2.3.1Addons
>
> Attachments: lucas.patch
>
> Original Estimate: 0.25h
> Remaining Estimate: 0.25h
>
> The Lucene library dependency has been updated to version 2.9.3. Thus, some
> classes had to be rewritten using the new Lucene Token API. Not all classes
> have been adapted to the new API, however, so that the component is not yet
> Lucene 3.x compliant.
> Lucas creates multiple Field instances for each field declared in the mapping
> file which is to be stored as well as indexed. This is done even when not
> necessary. As this may collide with a unique-key property (e.g. in Solr) a
> new attribute "unique" has been added to the field element of the mapping
> file. If the value of this attribute is set to "true" and there is only one
> declaration for this field name in the mapping file, there will be created
> only one field instance.
> This addition has been added to the project's docbook (along with quite some
> spelling corrections, a few reformulations and corrections to the examples).
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