"Portlet is temporarily unavailable." and NPE is thrown when filtering by "Any Time" in Classic (legacy) Search Portlet

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.10 DXP FP5, 7.2.10.2 DXP SP2, 7.2.X, 7.3.X, 7.3.5 CE GA6, 7.3.10 DXP GA1, Master
• Fix Version/s: 7.2.X, 7.3.X, Master
• Component/s: Web Search > Search Widgets
• Labels:
  • backend_test
  • ee-ts
  • liferay-fixpack-dxp-9-7210
• Branch Version/s:
  7.3.x, 7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Last Working Version:
  7.2.10 DXP FP4
• Sprint: Search|S04Sprint 1|11.2-11.23
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/95918

The Classic Search portlet has been deprecated as of 7.1 (2018): https://help.liferay.com/hc/en-us/articles/360017897432-Deprecated-Apps-in-7-1-What-to-Do#foundation

---

1. Create a Web Content with title "liferay"
2. Create a new user "member"
3. Add user to Liferay DXP site
4. Add classic Search widget to a page (it's under the "Tools" category)
5. Log in with "member"
6. Search for "liferay"
7. No error
8. Filter by "Any Time"

Expected result: No error, page is rendered without issues.
Actual result: "Portlet is temporarily unavailable." error on the UI and console shows the following error:

2020-11-09 12:04:24.658 ERROR [https-jsse-nio-8443-exec-4][render_portlet_jsp:131] null
java.lang.NullPointerException
	at com.liferay.portal.search.internal.facet.FacetBucketUtil.isFieldInBucket(FacetBucketUtil.java:40)
	at com.liferay.portal.search.internal.facet.FacetDiscounter.lambda$_findTermsOfField$0(FacetDiscounter.java:108)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1654)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at com.liferay.portal.search.internal.facet.FacetDiscounter._exclude(FacetDiscounter.java:88)
	at com.liferay.portal.search.internal.facet.FacetDiscounter.discount(FacetDiscounter.java:43)
	at com.liferay.portal.search.internal.facet.FacetPostProcessorImpl.exclude(FacetPostProcessorImpl.java:43)
	at com.liferay.portal.search.internal.permission.DefaultSearchResultPermissionFilter.filterHits(DefaultSearchResultPermissionFilter.java:151)
	at com.liferay.portal.search.internal.permission.DefaultSearchResultPermissionFilter$SlidingWindowSearcher.search(DefaultSearchResultPermissionFilter.java:340)
	at com.liferay.portal.search.internal.permission.DefaultSearchResultPermissionFilter.search(DefaultSearchResultPermissionFilter.java:118)
	at com.liferay.portal.kernel.search.BaseIndexer.search(BaseIndexer.java:583)
	at com.liferay.portal.search.internal.searcher.SearcherImpl.search(SearcherImpl.java:231)
	at com.liferay.portal.search.internal.searcher.SearcherImpl.doMultiIndexerSearch(SearcherImpl.java:125)