Adrien Grand created LUCENE-5922:
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             Summary: DocValuesDocIdSet is not cacheable
                 Key: LUCENE-5922
                 URL: https://issues.apache.org/jira/browse/LUCENE-5922
             Project: Lucene - Core
          Issue Type: Bug
    Affects Versions: 4.10
            Reporter: Adrien Grand
             Fix For: 4.11


This DocIdSet claims it is cacheable although bad things could happen if it was 
cached since it is not thread-safe and keeps handles to open files.

The fix is simple, especially given that this doc id set is cheap to create. 
But I'm wondering if there is a way we could protect ourselves from such bugs 
in the future.



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