我正在使用Solr 6.2。我试图在Solr搜索组件中配置多个搜索器定义，并获得错误信息，如：

java.lang.IllegalArgumentException: Invalid reference 'softId_suggest'
at org.apache.lucene.expressions.SimpleBindings.getValueSource(SimpleBindings.java:84)
at org.apache.lucene.expressions.ExpressionValueSource.<init>(ExpressionValueSource.java:45)
at org.apache.lucene.expressions.Expression.getValueSource(Expression.java:80)
at org.apache.solr.spelling.suggest.DocumentExpressionDictionaryFactory.fromExpression(DocumentExpressionDictionaryFactory.java:107)
at org.apache.solr.spelling.suggest.DocumentExpressionDictionaryFactory.create(DocumentExpressionDictionaryFactory.java:92)
at org.apache.solr.spelling.suggest.SolrSuggester.build(SolrSuggester.java:174)
at org.apache.solr.handler.component.SuggestComponent$SuggesterListener.buildSuggesterIndex(SuggestComponent.java:528)
at org.apache.solr.handler.component.SuggestComponent$SuggesterListener.newSearcher(SuggestComponent.java:508)
at org.apache.solr.core.SolrCore.lambda$3(SolrCore.java:1863)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

字符串
在我的Solrtlog.xml中的配置是：

<field name="softId_suggest" type="int" indexed="true"  stored="true"  />
<copyField source="softId" dest="softId_suggest" />

型

<lst name="suggester">
   <str name="name">MySuggest</str>
   <str name="lookupImpl">AnalyzingInfixLookupFactory</str>
   <str name="dictionaryImpl">DocumentExpressionDictionaryFactory</str>
   <str name="field">suggest_name</str>
   <str name="highlight">false</str>
   <str name="weightExpression">softId_suggest</str>       
   <str name="indexPath">analyzingInfixSuggesterIndexDir</str>
   <str name="suggestAnalyzerFieldType">text_suggest</str>
 </lst>

型
从lucene的源代码中我知道，似乎字段softId_suggest是null，但如何配置它是正确的？