FreeTextSuggester exception: need at least one suggestion

["Buckler, Christine" <Ch...@nordstrom.com>]

Hi fellow Solr Suggesters,

I am getting an exception when building the suggester index for: FreeTextSuggester…

java.lang.IllegalArgumentException: need at least one suggestion
at org.apache.lucene.search.suggest.analyzing.FreeTextSuggester.build(FreeTextSuggester.java:300)
at org.apache.lucene.search.suggest.analyzing.FreeTextSuggester.build(FreeTextSuggester.java:247)
at org.apache.lucene.search.suggest.Lookup.build(Lookup.java:190)
at org.apache.solr.spelling.suggest.SolrSuggester.build(SolrSuggester.java:181)
at org.apache.solr.handler.component.SuggestComponent$SuggesterListener.buildSuggesterIndex(SuggestComponent.java:529)
at org.apache.solr.handler.component.SuggestComponent$SuggesterListener.newSearcher(SuggestComponent.java:511)
at org.apache.solr.core.SolrCore.lambda$getSearcher$17(SolrCore.java:2275)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:188)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.base/java.lang.Thread.run(Thread.java:844)

What does it mean by at least one suggestion? I have ngrams=2, does this mean that it requires document fields to be at least 2 word/tokens? I have tried testing with only >2 and still get an exception.

Christine