[ http://issues.apache.org/jira/browse/LUCENE-494?page=all ]
Mark Harwood updated LUCENE-494:
--------------------------------
Attachment: QueryAutoStopWordAnalyzerTest.java
> Analyzer for preventing overload of search service by queries with common
> terms in large indexes
> ------------------------------------------------------------------------------------------------
>
> Key: LUCENE-494
> URL: http://issues.apache.org/jira/browse/LUCENE-494
> Project: Lucene - Java
> Type: New Feature
> Components: Analysis
> Reporter: Mark Harwood
> Priority: Minor
> Attachments: QueryAutoStopWordAnalyzer.java,
> QueryAutoStopWordAnalyzerTest.java
>
> An analyzer used primarily at query time to wrap another analyzer and provide
> a layer of protection
> which prevents very common words from being passed into queries. For very
> large indexes the cost
> of reading TermDocs for a very common word can be high. This analyzer was
> created after experience with
> a 38 million doc index which had a term in around 50% of docs and was causing
> TermQueries for
> this term to take 2 seconds.
> Use the various "addStopWords" methods in this class to automate the
> identification and addition of
> stop words found in an already existing index.
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