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https://issues.apache.org/jira/browse/LUCENE-7078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar updated LUCENE-7078:
------------------------------------------
    Fix Version/s:     (was: 6.3)
                   6.4

> Make remaining mutable Queries immutable
> ----------------------------------------
>
>                 Key: LUCENE-7078
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7078
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/search
>            Reporter: Luc Vanlerberghe
>            Priority: Minor
>             Fix For: master (7.0), 6.4
>
>
> See LUCENE-6531
> Mutable queries are an issue for automatic filter caching since modifying a 
> query after it has been put into the cache will corrupt the cache. We should 
> make all queries immutable (up to the boost) to avoid this issue.
> Since they are part of the public API I would suggest splitting them in an 
> immutable class and a builder like was done for most other Queries *before* 
> releasing an official 6.x version
> I did a quick scan through all derived classes of Query and I compiled the 
> following list (ignoring sources in test or contrib folders)
> Some of them are already marked as experimental (but should perhaps receive 
> the "official" @lucene.experimental tag ?)
> For some it's possibly not an issue since they should never end up in a 
> filter cache (like MoreLikeThisQuery ?), but then a comment specifying the 
> exception to the rule should perhaps be added.
> * lucene/queries:
> ** org.apache.lucene.queries.CommonTermsQuery
> ** org.apache.lucene.queries.CustomScoreQuery (marked as @lucene.experimental)
> ** org.apache.lucene.queries.mlt.MoreLikeThisQuery
> * lucene/suggest:
> ** org.apache.lucene.search.suggest.document.ContextQuery (marked as 
> @lucene.experimental)
> * lucene/facet:
> ** org.apache.lucene.facet.DrillDownQuery (marked as @lucene.experimental)



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