Solr - Clean up Index

Sometimes you want to delete all the records from the Solr index without deleting the index directory.

This can be done by executing an http url :-

http://host:port/solr/core/update?stream.body=<delete><query>*:*</query></delete>&commit=true

Or by posting data xml data :-

<delete><query>*:*</query></delete>

Cleaning data using Solrj :-

SolrServer server = null;
try {
    server = new CommonsHttpSolrServer(masterIndexUrl);
    server.deleteByQuery("*:*");
    server.commit(true, true);
    server.optimize(true, true);            
} catch (Exception e) {
    try {
        server.rollback();                
    } catch (Exception e1) {
        
    }
}