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.
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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
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.
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