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https://issues.apache.org/jira/browse/SOLR-18175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18072131#comment-18072131
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David Smiley commented on SOLR-18175:
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We're not going to change Lucene for this; this is a Solr matter to address. I
recommend doing so in {{FieldType.getExistenceQuery}} by checking the schema
characteristics.
> A FieldExistsQuery IllegalStateException should result in HTTP 400 not 500
> error
> --------------------------------------------------------------------------------
>
> Key: SOLR-18175
> URL: https://issues.apache.org/jira/browse/SOLR-18175
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Priority: Minor
> Labels: newdev
>
> If you issue an existence query {{field:*}} yet that field does not support
> Lucene's {{FieldExistsQuery}}, FEQ.rewrite will throw IllegalStateException:
> bq. FieldExistsQuery requires that the field indexes doc values, norms or
> vectors, but field 'foo' exists and indexes neither of these data structures
> Solr ultimately returns a HTTP 500, which is not what we want. We want HTTP
> 400. Note that I discovered this via a {{facet.query}} and have yet to check
> if it were to happen simply in a {{q}}. The change likely involves modifying
> Solr {{FieldType.getExistenceQuery}} to throw an exception with the 400 code.
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