question: @ Before public void before ( ) throws Exception { tmpSolrHome = createTempDir ( ) ; FileUtils . copyDirectory ( new File ( TEST_HOME ( ) ) , tmpSolrHome . getAbsoluteFile ( ) ) ; final SortedMap < ServletHolder , String > extraServlets = new TreeMap < > ( ) ; final ServletHolder solrRestApi = new ServletHolder ( "SolrSchemaRestApi" , ServerServlet . class ) ; solrRestApi . setInitParameter ( "org.restlet.application" , "org.apache.solr.rest.SolrSchemaRestApi" ) ; extraServlets . put ( solrRestApi , "/schema/*" ) ; System . setProperty ( "managed.schema.mutable" , "true" ) ; System . setProperty ( "enable.update.log" , "false" ) ; createJettyAndHarness ( tmpSolrHome . getAbsolutePath ( ) , "solrconfig-managed-schema.xml" , "schema-rest.xml" , "/solr" , true , extraServlets ) ; }
target:  Setup to make the schema mutable