Exception thrown when Maximum Query Terms is set to 0, Minimum Term Frequency is set to 1, and Field is blank

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, Master
• Fix Version/s: 7.2.X, 7.3.1 CE GA2, 7.3.2 CE GA3, 7.3.10 DXP GA1, Master
• Component/s: Web Search > Search Widgets
• Labels:
  • ee-bp
  • marketplace-portal-search-similar-results-1.0.0-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 1
• Epic Link: Similar Results
• Sprint: Search|S03 Sprint 11 |2.3-2.21, Search|S03 Sprint 12|2.24-3.16
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/85274

An easy workaround is to define the field in Fields. For example, after setting Fields to "title_en_US" the issue is no longer reproducible.

Steps to reproduce:

1. Create two web content articles with the following titles:
   1. Similar Results Web Content 1
   2. Similar Results Web Content 2
2. Add Similar Results and Asset Publisher to the page
3. Make the following changes in Similar Results configuration:
   1. Maximum Query Terms: 0
   2. Minimum Term Frequency: 1
4. Click on "Similar Results Web Content 1" in Asset Publisher

Expected result:
Expected no results with no exceptions thrown.

Actual result:

2020-01-31 01:02:56.315 ERROR [http-nio-8080-exec-7][ElasticsearchIndexSearcher:169] java.lang.RuntimeException: org.elasticsearch.action.search.SearchPhaseExecutionException: Failed to execute phase [query], all shards failed; shardFailures {[ruAnFIXLSO-eCgYVcr1Dyg][liferay-20095][0]: RemoteTransportException[[ruAnFIX][127.0.0.1:9300][indices:data/read/search[phase/query]]]; nested: NullPointerException; }
java.lang.RuntimeException: org.elasticsearch.action.search.SearchPhaseExecutionException: Failed to execute phase [query], all shards failed; shardFailures {[ruAnFIXLSO-eCgYVcr1Dyg][liferay-20095][0]: RemoteTransportException[[ruAnFIX][127.0.0.1:9300][indices:data/read/search[phase/query]]]; nested: NullPointerException; }
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractSearchAsyncAction.java:293)
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.executeNextPhase(AbstractSearchAsyncAction.java:133)
	at org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseDone(AbstractSearchAsyncAction.java:254)
	at org.elasticsearch.action.search.InitialSearchPhase.onShardFailure(InitialSearchPhase.java:101)
	at org.elasticsearch.action.search.InitialSearchPhase.access$100(InitialSearchPhase.java:48)
	at org.elasticsearch.action.search.InitialSearchPhase$2.lambda$onFailure$1(InitialSearchPhase.java:222)
	at org.elasticsearch.action.search.InitialSearchPhase.maybeFork(InitialSearchPhase.java:176)
	at org.elasticsearch.action.search.InitialSearchPhase.access$000(InitialSearchPhase.java:48)
	at org.elasticsearch.action.search.InitialSearchPhase$2.onFailure(InitialSearchPhase.java:222)
	at org.elasticsearch.action.search.SearchExecutionStatsCollector.onFailure(SearchExecutionStatsCollector.java:73)
	at org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:51)
	at org.elasticsearch.action.search.SearchTransportService$ConnectionCountingHandler.handleException(SearchTransportService.java:464)
	at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1130)
	at org.elasticsearch.transport.TransportService$DirectResponseChannel.processException(TransportService.java:1247)
	at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1221)
	at org.elasticsearch.transport.TaskTransportChannel.sendResponse(TaskTransportChannel.java:66)
	at org.elasticsearch.action.support.HandledTransportAction$ChannelActionListener.onFailure(HandledTransportAction.java:112)
	at org.elasticsearch.search.SearchService$2.onFailure(SearchService.java:347)
	at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:341)
	at org.elasticsearch.search.SearchService$2.onResponse(SearchService.java:335)
	at org.elasticsearch.search.SearchService$4.doRun(SearchService.java:1082)
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:723)
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
	at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:41)
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Reproduced on:
Tomcat 9.0.17 + MySQL 5.7
Portal master GIT ID: 2c5c7969b3ee35b944879281b6a82fdb2c63bafa
Portal 7.2.x GID ID: 178dbb73143636870f93db4fbff1029fce4f05f7