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https://issues.apache.org/jira/browse/LUCENE-6814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906061#comment-14906061
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Uwe Schindler commented on LUCENE-6814:
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It should call something like setLength(MIN_SIZE).trimToSize() on close().
> PatternTokenizer should free heap after it's done
> -------------------------------------------------
>
> Key: LUCENE-6814
> URL: https://issues.apache.org/jira/browse/LUCENE-6814
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: Trunk, 5.4
>
>
> Caught by Alex Chow in this Elasticsearch issue:
> https://github.com/elastic/elasticsearch/issues/13721
> Today, PatternTokenizer reuses a single StringBuilder, but it doesn't free
> its heap usage after tokenizing is done. We can either stop reusing, or ask
> it to {{.trimToSize}} when we are done ...
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