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https://issues.apache.org/jira/browse/LUCENE-7562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-7562.
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Resolution: Fixed
> CompletionFieldsConsumer throws NPE on ghost fields
> ---------------------------------------------------
>
> Key: LUCENE-7562
> URL: https://issues.apache.org/jira/browse/LUCENE-7562
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7562.patch
>
>
> If you index {{SuggestField}} for some field X, but later delete all
> documents with that field, it can cause a ghost situation where the field
> infos believes field X exists yet the postings do not.
> I believe this bug is the root cause of this ES issue:
> https://github.com/elastic/elasticsearch/issues/21500
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