[jira] Assigned: (LUCENE-494) Analyzer for preventing overload of search service by queries with common terms in large indexes

["Grant Ingersoll (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Grant Ingersoll reassigned LUCENE-494:
--------------------------------------

    Assignee: Grant Ingersoll

> Analyzer for preventing overload of search service by queries with common terms in large indexes
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-494
>                 URL: https://issues.apache.org/jira/browse/LUCENE-494
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>            Reporter: Mark Harwood
>            Assignee: Grant Ingersoll
>            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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