显然，您的 Solr 服务器已关闭.如果启动失败，请检查 Solr 日志.

Apparently, your Solr server is down. Please check the Solr logs if the startup has failed.

tail -n 200 /tmp/solr.log # or wherever Solr writes its logs

如果您的 schema.xml、solrconfig.xml 中有错误，或者应该包含不存在的文件时，就会发生这种情况.

This can happen if you have an error in your schema.xml, your solrconfig.xml, or when a file should be included which doesn't exist.