Thanks Alex. I try the following to set the atomic processor: http://localhost:8983/solr/test4/update?processor=atomic&Atomic.text2=add
However, I get the following error: <response> <lst name="responseHeader"> <int name="status">400</int> <int name="QTime">4</int> </lst> <lst name="error"> <lst name="metadata"> <str name="error-class">org.apache.solr.common.SolrException</str> <str name="root-error-class">org.apache.solr.common.SolrException</str> </lst> <str name="msg">No such processor atomic</str> <int name="code">400</int> </lst> </response> I read in https://medium.com/@sarkaramrit2/atomicupdateprocessorfactory-in-apache-solr-c9be62a29117 that "You need not to declare / define AUPF in solrconfig.xml". What is the problem? Best, Zahra -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html