如何在solr中编写嵌套的schema.xml
schema.xml中的文档说
<!-- points to the root document of a block of nested documents. Required for nested
document support, may be removed otherwise
-->
<field name="_root_" type="string" indexed="true" stored="false"/>
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哪个可以使用
https://cwiki.apache.org/confluence/display/solr/Other+Parsers#OtherParsers-BlockJoinQueryParsers
什么是schema.xml用于嵌套以下项目: