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https://issues.apache.org/jira/browse/LUCENE-1058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544096
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Michael McCandless commented on LUCENE-1058:
--------------------------------------------

I think the discussion in LUCENE-1063 is relevant to this issue: if you store 
(& re-use) Tokens you may need to return a copy of the Token from the next() 
method to ensure that nay filters that alter the Token don't mess up your 
private copy.

> New Analyzer for buffering tokens
> ---------------------------------
>
>                 Key: LUCENE-1058
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1058
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: LUCENE-1058.patch
>
>
> In some cases, it would be handy to have Analyzer/Tokenizer/TokenFilters that 
> could siphon off certain tokens and store them in a buffer to be used later 
> in the processing pipeline.
> For example, if you want to have two fields, one lowercased and one not, but 
> all the other analysis is the same, then you could save off the tokens to be 
> output for a different field.
> Patch to follow, but I am still not sure about a couple of things, mostly how 
> it plays with the new reuse API.
> See 
> http://www.gossamer-threads.com/lists/lucene/java-dev/54397?search_string=BufferingAnalyzer;#54397

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