use reusable collation keys in ICUCollationFilter
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Key: LUCENE-1643
URL: https://issues.apache.org/jira/browse/LUCENE-1643
Project: Lucene - Java
Issue Type: Improvement
Components: contrib/*
Reporter: Robert Muir
Priority: Trivial
Attachments: LUCENE-1643.patch
ICUCollationFilter need not create a new CollationKey object for each token.
In ICU there is a mechanism to use a reusable key.
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