[LUCENE-9133] TermFilteredPresearcher NPE issue with empty fields - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 8.6
Component/s: None
Labels:
None

Lucene Fields:

New

Description

Encountered a situation where a document contained a field value which analyzed away to nothing. The result was a NPE in TermFilteredPresearher#buildQuery. We filter out purely empty fields before creating the Document for Monitor#match but it's hard to know up front when a non-empty field will produce zero tokens after analysis. Will follow up with a PR containing a simple unit test that triggers the NPE along with a proposed fix.