Solr FQA，
1. Question: sometimes the after closing the SolrServer, there is a file write.lock generated in the folder $INDEX_HOME/index/write.lock. Then next time, you want to start the server, there is an exception complaining the IndexWriter is locked.1. Answer: Manually delete the write.lock file. or adding the below lines into solrconfig.xml file avoids the issue of physically removing the write.lock file when doing indexing.
<lockType>simple</lockType>
<unlockOnStartup>true</unlockOnStartup>
It's better to find a way to delete it pragmatically.
2. how to delete all index from curl
curl http://localhost:8080/solr/update -H "Content-Type: text/xml" --data-binary '<delete><query>*:*</query></delete>'
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