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https://issues.apache.org/jira/browse/LUCENE-7899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075150#comment-16075150
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ASF subversion and git services commented on LUCENE-7899:
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Commit f288b440b76f6b2ab23cc134054e2b1d374d182a in lucene-solr's branch
refs/heads/branch_7_0 from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=f288b44 ]
LUCENE-7899: add text after header in MIGRATE.txt
> Rename FieldValueQuery to DocValuesFieldExistsQuery
> ---------------------------------------------------
>
> Key: LUCENE-7899
> URL: https://issues.apache.org/jira/browse/LUCENE-7899
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Blocker
> Fix For: 7.0, master (8.0)
>
> Attachments: LUCENE-7899.patch
>
>
> I don't think we have a query today to efficiently test whether a doc values
> field exists (has any value) for each document in the index?
> Now that we use iterators to access doc values, this should be an efficient
> query: we can return the DISI we get for the doc values.
> ElasticSearch indexes its own field to record which field names occur in a
> document, so it's able to do "exists" for any field (not just doc values
> fields), but I think doc values fields we can just get "for free".
> I haven't started on this ... just wanted to open the issue first for
> discussion.
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