谢谢。
我的Solr（7.3.1）发生此错误。
null:org.apache.solr.common.SolrException: Error opening new searcher
at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:2095)
at org.apache.solr.core.SolrCore.getSearcher(SolrCore.java:2215)
...
Caused by: org.apache.lucene.store.AlreadyClosedException: this IndexWriter is closed
at org.apache.lucene.index.IndexWriter.ensureOpen(IndexWriter.java:897)
at org.apache.lucene.index.IndexWriter.ensureOpen(IndexWriter.java:911)
...
Caused by: java.lang.IllegalStateException: found existing value for PerFieldPostingsFormat.format, field=foo_bar, old=Lucene50, new=Lucene50
at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.buildFieldsGroupMapping(PerFieldPostingsFormat.java:226)
at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.merge(PerFieldPostingsFormat.java:152)
...
显示的错误消息字段名称为*_ngram和*_s
<types>
<fieldType name="string" class="solr.StrField" omitNorms="true"/>
<fieldType name="text_ngram" class="solr.TextField" omitNorms="true" autoGeneratePhraseQueries="true">
<analyzer>
<charFilter class="solr.MappingCharFilterFactory" mapping="lang/mapping-japanese.txt"/>
<tokenizer class="solr.NGramTokenizerFactory" maxGramSize="2" minGramSize="2"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="org.apache.lucene.analysis.icu.ICUTransformFilterFactory" id="Katakana-Hiragana"/>
</analyzer>
</fieldType>
</types>
<fields>
<dynamicField name="*_s" type="string" stored="false" multiValued="false" indexed="true"/>
<dynamicField name="*_ngram" type="text_ngram" stored="false" multiValued="false" indexed="true"/>
</fields>
请帮助我。