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https://issues.apache.org/jira/browse/LUCENE-2393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857107#action_12857107
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Otis Gospodnetic commented on LUCENE-2393:
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I think creating a small index with a couple of docs would be the way to go.
> Utility to output total term frequency and df from a lucene index
> -----------------------------------------------------------------
>
> Key: LUCENE-2393
> URL: https://issues.apache.org/jira/browse/LUCENE-2393
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/*
> Reporter: Tom Burton-West
> Priority: Trivial
> Attachments: LUCENE-2393.patch
>
>
> This is a command line utility that takes a field name, term, and index
> directory and outputs the document frequency for the term and the total
> number of occurrences of the term in the index (i.e. the sum of the tf of the
> term for each document). It is useful for estimating the size of the term's
> entry in the *prx files and consequent Disk I/O demands
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